Editing Identifying Chevy engines

{{Develop1}} ==Overview== Identifying Chevy engines isn't that difficult if all that's needed is to know whether it's a BBC or SBC, or a six or V8, etc. But to get into the finer points requires digging deeper. ==Block casting numbers and codes== [[File:S-bbc block id.jpg|thumb|500px|Locations of Chevy V8 block ID numbers and codes]] One of the easiest way to identify a Chevrolet engine is by the casting number (c/n) that is cast into the castings (not stamped). [[Chevy engine casting numbers]] has several sites that are useful. The Chevy V8 block casting number is generally atop the transmission mounting area of the block. The date code will usually be found in the same area, sometimes on the opposite side from the casting number, but not always. It is common to use just the last three numbers of the c/n when dealing with casting numbers, i.e. block c/n 10243880 would be called an "880" block. Usually the last three numbers aren't repeated but there are cases like the SBC head c/n 462 that- for some unknown reason- was reused 5 times! Fortunately this is rare. <br style="clear:both"/> ===SBC engine casting numbers=== {{Note1}} The Mortec site is no longer available. *[[Identifying Chevy engines#Mortec info|'''Mortec info''']] *[http://outintheshop.com/faq/casting/castings2.html Chevy BB and SB casting number "go-to" site] from outintheshop.com *[http://www.nastyz28.com/sbchevy/sblock.html smallblock info] from nastyz28.com *[http://www.73-87.com/chevy_ids/sbcid2.htm SBC ID] from www.73-87.com *[http://www.classictruckshop.com/castgm_smblock.asp SBC casting numbers] from classictruckshop.com *[http://www.inliners.org/becks/BCN2.html Inline engine casting numbers] from inliners.org ===BBC casting numbers=== *[http://www.nastyz28.com/bbcmenu.php Big Block Chevy Engine Parts Identification] from nastyz28.com ==Suffix codes== [[File:EngineCodepartialVIN.jpg|right]] Suffix codes are stamped into a small boss on the front passenger side of the block where the head and block meet. There will sometimes be two lines of numbers and letters, later engines had just one line of numbers and letters.<br> *[http://chevymania.com/partsid/suffix.cfm?block=Small SBC suffix code list] from Chevymania.com *[http://chevymania.com/partsid/suffix.cfm?block=Big BBC suffix code list] from Chevymania.com *[http://www.nastyz28.com/chevy-engine-code-stampings.php Suffix and VIN codes] from nastyz28.com ==Date code== The date code is most often found back by where the transmission bolts to the engine block, on the top side of the block. The date code generally has a letter followed by two or three numbers. The letter is the month. The next number or two numbers will be the day of the month. The last number is the last digit of the year. :Example: '''C124''' :*C = March (A = Jan., B = Feb., etc.) :*12 = day of the month :*4 = year ending in 4, i.e. 1964, 1974, 1984, etc. ==Factory hydraulic roller SBC block ID== Hydraulic roller valve trains were used beginning in 1986. During this period, there were both roller and flat tappet (non roller) equipped engines available. Some blocks came completely machined for a mechanical fuel pump. Others have either partial or no machining of the block to use a mechanical F/P. It has been said that most or all of the c/n 638 blocks are ready to use a mechanical pump. In EFI applications, these engines will have a block off plate covering the mechanical pump area. Casting number 880 blocks have been seen both with and without mechanical pump provisions, and casting number 148 is mostly without the mechanical pump provision. Blocks with a 4" nominal bore diameter (as used on the 350/5.7L SBC engines) that are equipped to use the factory hydraulic roller valve train, are casting numbers: *10243880 (common casting number of a 5.7L Vortec engine) *14011148 *14088526 *14093638 Some of the 1986-up Chevy small block engines used flat tappet (i.e. non-roller) cams. 350 cid/5.7L flat tappet blocks are casting numbers: *10054727 *14079287 *14088548 *14101148 These flat tappet blocks '''''may''''' have the provisions for a roller cam (i.e. bosses present and drilled/tapped for the spider and for the cam plate, etc.), but also may '''not''' be equipped with the drilled and threaded bosses needed to use a factory roller valve train. In any event, these blocks originally had a flat tappet cam and non-roller lifters, no spider, and no cam thrust plate. These blocks are fine if you don't care about the roller cam. '''Note:''' There is a flat tappet block and a roller block that both end with the numbers 148. 14101148 is a flat tappet truck block, 14011148 is a roller provisioned block. ===Vortec block cylinders=== The Vortec cylinders are shorter than in previous blocks, as shown below: [[File:SBC BORE DEPTH 002.jpg]] ==SBC Head casting numbers== *[http://outintheshop.com/faq/casting/castings2.html SBC head casting number "go-to" site] from outintheshop.com *[http://chevytech.info/3c10o12.html Head info by c/n, some with photos] from chevytech ==Dampers/balancers== ===SBC=== The earliest SBC 265 dampers had a riveted on crank pulley (red arrow) attached to a steel hub, as shown below. {| |[[File:Sbc 265 damper.jpg|thumb|left|500px|SBC 265 damper hub with attached pulley, front]] |[[File:Sbc 265 damper2.jpg|thumb|left|500px|SBC 265 damper hub, back]] |} On other SBC engines, including internally balanced stroker engines, the dampers are neutral balanced. The differences will be in the location of the TDC line, weight, thickness and diameter of the dampers. On the 400 SBC and externally balanced stroker engines, an OEM damper will have a scalloped portion to the outer ring which is easily seen. Aftermarket dampers usually use a bolted on counterweight, which is also usually easily seen. Not as easily seen is the gap or void in the SBC 400 main bulkhead webbing. [[File:Sbc400balancer.jpg|thumb|300px|left|OEM 400 balancer. Note scalloped outer ring]] [[File:Sbc400main web.jpg|thumb|400px||right|Void in 400 main webbing]] <br style="clear:both"/> ==BBC== ===Damper/balancers=== The 396/402 and 427 ci BBC engines were internally balanced. The 454 BBC engine is externally balanced. The 454 can be ID'd by the balancer having the inner hub cast with an integral counterweight (see image below). A 454 will also have a different flexplate/flywheel, having an added counterweight that is missing from the other displacement BBC engines. Like the SBC aftermarket dampers, the counterweight of a 454 damper might be bolted to the hub. [[File:Bbc 454 damper.jpg|thumb|left|500px|BBC 454 balancer with inner ring scalloped]] <br style="clear:both"/> ===BBC notched bores=== A BBC block may have bores notched to clear the intake valves. Not present on all BBC engines. [[File:BBC 454 BLOCK NOTCHED BORES.jpg]] <br style="clear:both"/> ===BBC external cues for 2- or 4-bolt bottom end=== While not 100%, a Mark IV BBC engine can sometimes be ID'd for being a 2- or 4-bolt bottom end by looking above the filter mount: [[File:Bbc 4-bolt vs 2-bolt fittings id.jpg|550px]] <br style="clear:both"/> ==396 block boring== Some 396 blocks will take an overbore to 4.250". One way to tell if the block has sufficient metal to do this is by removing a center freeze plug from the side of the block, then see if a ~1/4" wooden dowel (a pencil will do) will fit in between the cylinder jackets. If it fits the walls are probably not thick enough to bore to 4.250". {{Note1}}This is not meant to be a replacement for sonic testing the bore thickness. It is only to judge whether the block is a candidate for sonic testing. ===Tall deck BBC=== The 10.2" deck height tall deck (TD) BBC was made in two different sizes: 366 and 427 cid. These engines were made to stand up to heavy duty use like bus and dump truck, etc. right up to where a diesel would be used. The tall deck height was to facilitate the height of the four ring piston used in the TD BBC engines. The bottom ends were forged and the rods were heavy duty-and heavy in weight. These engines can be made into good performing engines without going to too much trouble or expense. '''[http://www.hotrodders.com/forum/cheapo-bbc-505-tall-deck-grunt-motor-164014.html#post1160950 Here]''' is a thread showing a budget build up of a 427 tall deck BBC. If the engine is assembled, the stock intake had two thermostats on it and the intake is also wider due to the taller decks. The distributor is different and may have a different oil pump drive arrangement. One of the easiest ways to tell a tall deck BBC block from a standard 9.8" deck height BBC block is to check the distance from the top water pump bolt hole to the block deck. A standard block (below left) will have very little space between the hole and deck; a tall deck block will have around 1/2" between the hole and deck (below right). [[File:454 deck.JPG]][[File:Bbc tall deck.jpg]] ==BBC 502== A production Chevy 502cid block can be a Gen V or VI. It will have "8.2" cast into the block, and will have 4-bolt mains with a one piece rear main seal. A 454 bore diameter will be about 4.25". A 502 will be about 4.5". ==Resources== *[[Chevy engine casting numbers]] ==Mortec info== ===Mortec SBC block casting numbers=== *Return to '''[[Identifying Chevy engines #SBC engine casting numbers|SBC engine casting numbers]] ''' above. *Return to [http://www.crankshaftcoalition.com/wiki/Swirl_port_SBC_heads#Resources '''Swirl port SBC heads/Resources'''] <pre>SBC BLOCK CASTING NUMBERS CASTING NUMBER.....SIZE...YEAR...MAIN CAP BOLTS....NOTES 140029.....350...80-84...2 330817.....400...72-80...2 355909.....262.....75....2 355909.....305...76-79...2 360851.....262...75-76...2...Monza V8 361979.....305...77-79...2 or 4, some Canadian assembled heavy duty blocks have 4-bolt main caps 366245.....350...78-79...4...Bowtie 366286...................4...Bowtie, siamesed, straight nodular iron main caps, 2-piece seal, 4.00”-4.150" bores, 2.45" main journals 366298...................4...Bowtie, Aluminum, billet main caps, 3.398" bore with sleeves, two piece rear main seal 366299...................4...Bowtie, Aluminum, nodular iron splayed caps, wet sump, 4.00" bore 389257.....302.....67....2 393288.....283...65-67...2 460703.....350.....78....4 460776.....305...78-79...2 460777.....305...78-79...2 460778.....305...78-79...2 or 4, some Canadian assembled heavy duty truck blocks have 4-bolt main caps 471511.....267...79-82...2 3556519....283...58-61...2 3703524....265.....55....2...No oil filter 3720991....265...56-57...2 3731548....265...57......2...No side motor mounts 3731548....283...57......2...No side motor mounts 3737739....283...58-64...2 3756519....283...58-62...2 3782870....327...62-67...2 3789817....283...62-64...2 3789817....327...62-67...2 3789935....283...61-64...2 3790721....283...62-64...2...Chevy II recessed oil filter boss 3790721....327...65-66...2...Chevy II recessed oil filter boss 3791362....327...62-67...2...Chevy II recessed oil filter boss 3792563....327.....65....2 3792582....283...64-65...2 3794226....283...58-63...2 3794460....327...62-64...2 3830944....327.....63....2 3834810....283...64-66...2 3834812....283...62-63...2 3837739....283...58-62...2 3849852....283...57-66...2 3849935....283...65-67...2 3858174....327...64-67...2 3858180....327...64-67...2 3858618....350...68-76...2 3862194....283...65-67...2...Chevy II recessed oil filter boss 3862812....283...62-64...2 3892657....302.....67....2...Z-28 Camaro 3892657....327.....67....2 3892657....350.....67....2...Camaro 3896944....283...66-67...2 3896948....283...66-67...2 3903352....327.....67....2 3914636....307.....68....2 3914638....307.....68....2 3914653....307...68-73...2 3914660....327.....68....2 3914678....302.....68....2...Z-28 Camaro 3914678....327.....68....2 3914678....350.....68....2 3931174....307.....68....2...Truck 3932371....307...69-73...2 3932373....307...68-73...2 3932386....302.....69....4...Z-28 Camaro 3932386....327.....69....2 3932386....350.....69....2 or 4 3932388....327.....69....2 3932388....350.....69....2 or 4 3933180....327...68-69...2 3951509....400...70-71...4 3951509....400...74-80...2 3951511....400...70-73...4...Some replacement blocks had 2-bolt main caps 3956618....302.....69....4...Z-28 Camaro 3956618....327...68-69...2 3956618....350.....69....2 or 4 3956632....307.....69....2 3959512....327...62-67...2...Was also used for some "CE" replacement blocks 3959532....283...64......2...Used for some "CE" replacement blocks 3959538....327...........2...Chevy II recessed oil filter boss, used for some Chevy II "CE" replacement blocks 3970010....302.....69....4...Z-28 Camaro 3970010....327.....69....2...Trucks and industrial 3970010....350...69-80...2 or 4 3970014....350...70-76...2 or 4 3970020....307...69-73...2 3970024....307...69-73...2 4715111....305.....80....2 6259425....350...69-76...2 10036033...350...........4...Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico" 10046164...305.....86....2 10049804.................4...Aluminum, Pontiac Super Duty version of Gen. 1 SBC, 4.00" bore, 350 mains, 2-piece rear seal, splayed caps, GTP race block 10051182.................2 or 4...Bowtie, 3.75"-4.30" bores, 1 or 2-piece rear seal 10051184.................4...Bowtie, 4.00"-4.155" bores, 1 or 2-piece rear seal 10054727...350...86-up...2 or 4...one piece rear seal, some "Made in Canada" 10066036...350...........2 or 4...Target Master/Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico" 10066038...350.....92....4...Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico" 10090511...350.....90....2...LT5, ZR1 Vette, 375hp 10125327...350...92-up...2 or 4...Gen. 2 LT1, reverse flow cooling 10125327...350...96-up...2 or 4...Gen. 2 LT4, reverse flow cooling 10134398.................4...Bowtie, Aluminum, 4.125" bore, 2.65" main journals 10134996.................4...Bowtie, Aluminum, 4.125" bore, 2.65" main journals 10153558...350...91-92...4...LT5, ZR1 Vette, 375hp 10168588...265...94-96...2...L99, Gen. 2, 4.3 Liter V-8, Caprice, reverse flow cooling 10199001...350...93-95...4...LT5, ZR1 Vette, 405hp 10243878...305...96-98...2...Vortec truck, roller cam, one-piece rear seal 10243880...350...95-00...2 or 4...Vortec truck, Gen. 1 crate motors and "ZZ4", roller cam, one piece rear seal 12550592...350...97-up...crossbolted block, Gen. 3, "LS1", aluminum 12551358.........99-up...Gen. 3, 4.8L or 5.3L, cast iron, truck 12551364...364...98-04...crossbolted cast iron Gen. 3, 6.0L, truck 12559378...350...99-up...crossbolted block, Gen. 3, "LS1", aluminum 12559846...350...98-up...crossbolted block, Gen. 3, "LS1", aluminum 12560621...350...98-up...crossbolted block, Gen. 3, "LS1", aluminum 12560626...350...99-up...crossbolted block, Gen. 3, "LS1", aluminum 12560629...350...99......crossbolted block, Gen. 3, "LS1", aluminum 12561168...350...01-up...crossbolted block, Gen. 3, "LS1", aluminum 12562174...350...98-up...crossbolted block, Gen. 3, "LS1", aluminum 12568952...364...05-up...crossbolted block, Gen. 3, 6.0L, aluminum, LS2 12566910...325...04-up...crossbolted block, Gen. 3, 5.3L, aluminum, SSR truck 12571048...325...04-up...crossbolted block, Gen. 3, 5.3L 12573581...364...98-04...crossbolted cast iron, Gen. 3, 6.0L, truck 12577184...364...98-04...crossbolted cast iron, Gen. 3, 6.0L, truck 12577396.........02-up...Gen. 3, 4.8L or 5.3L, cast iron, truck 14010201...305...80-85...2 14010202...305...80-85...2 14010203...305...80-85...2 14010207...350...80-85...2 or 4 14010209...350...80-85...2 or 4 14010280...267...79-82...2 14011064...350...83......4 14011148...350...87-89.......Roller cam, one-piece rear seal 14016376...267...79-82...2 14016379...350...77-79...2 or 4 14016381...305...80-84...2 14016382...305...79-84...2 14016383...305...80-85...2...Truck 14079287...350...86-90.......Truck 14088526...350...87-89.......Roller cam, one-piece rear seal 14088548...350...86-88...2 or 4 14088551...305...86-87...2...one-piece rear main seal 14093627...305...87-94...2...Roller or flat tappet cam, one-piece rear seal 14093638...350...87-95...2 or 4...Roller or flat tappet cam, one-piece rear seal 14094766...305...86-up...2...One-piece rear seal 14101147...305...85-up...2 14101148...350...86-90...4...One-piece rear seal 14102058...305...87-91...2...Roller cam, one-piece rear seal 22551656.................4...Chevy/Olds Rocket block, 4.00"-4.190" bores, 2.45" main journal, splayed caps, dry sump, 2-piece rear seal, 9.025" deck 22551660.................4...Chevy/Olds Rocket block, 4.00"-4.190" bores, 400 main journal, splayed steel caps, wet sump, raised cam, 2-piece rear seal, 9.300" deck </pre> ===Mortec SBC head casting numbers=== <pre>SMALL BLOCK HEAD CASTING NUMBERS: 330545.....73......350..........76cc chamber, 2.02”/1.60” 333881.....74-75...350..........76cc chamber, 2.02”/1.60” 333882.....74-80...350/400......76cc chamber 340292.....70's.......Over the counter, angle plug, 64cc chamber 354434.....75-79...262/267/305...60cc chamber 358741.....76-79...305 376445.....77-85...350..........76cc chamber, small valves 376450.....75-81...262/267/305..6 or 7 exhaust bolt holes, 60cc chamber 462614.....77-79...305..........60cc chamber 462624.....75-86...350/400......76cc chamber, 1.72”/1.5”, 1.94”/1.5” or 2.02”/1.6” valves 458642.....75-84...350..........350 468642.....76-up...350/400 471513.....79......267/350 517513.....79......267/350 1816887....63......283..........Made in Canada, GMC HD truck 3636839....55......265 3703523....55......265 3713358....55-56...265 3713569....55-56...265 3725306....56......265 3731539....57......283..........283 HP FI 3731544....57-61...283 3731554....57-62...283 3731556....57......283..........Truck, made in Canada 3731762....56......265..........Vette, 2x4 carbs 3737775....62-67...283/327 3740997....57......283..........1x4, 2x4 & FI (exc. 283hp) 3743056....58......283 3743096....62-67...327..........GMC Truck 3747363....57-61...283 3747460....59-67...283/327......70cc chamber 3748770....58......283 3748772....58-61...283 3755537....57-62...283 3755539....58-62...283 3755549....57-62...283 3755550....59......283 3755585....62-67...327..........GMC Truck 3767460....59-60...283 3767462....62-67...327 3767465....59-61...283 3767754....59-61...283..........60cc chamber 3767792....60-64...283 3774682....60-64...283/327......70cc chamber 3774684....62-64...327..........75cc chamber 3774692....58-64...283..........60cc chamber 3782461....64-66...327......Camel hump, no accessory holes, 160cc/62cc port volumes, 62cc chamber 3782461X...60-63...283/327..Camel hump, no accessory holes, larger 172cc/64cc port volumes, 62cc chamber 3795896....63-65...283......60cc chamber 3795896....62-64...327......60cc chamber 3798996....63-67...327 3814480....60-67...283/327..70cc chamber, 1.72”/1.5” valves 3814482....62-67...283/327/350..75cc chamber 3817680....63-67...283/327 3817681....62-67...327 3817682....61-62...283 3836839....55......265 3836842....57-67...283/327 3837064....56-62...265/283 3837065....55-56...265..........Truck 3848720....57-58...283 3876775....60-67...283/327......75cc chamber 3884520....60-67...283..........Some marked "Made in Canada", 60cc chamber, also used by Studebaker 3884520....62-67...327..........Some marked "Made in Canada", 60cc chamber, also used by Studebaker 3890462....66-67...302/327/350..Camel hump, no accessory holes, 64cc chamber 3901068....87-up...350..........Crate motor, 285hp, 64cc chamber 3911032....68......307/327......70cc chamber 3912264....58-62...283 3912265....63-64...283 3912311....65-67...327 3912313....65-67...327 3917290....67-68...307/327 3917291....67-68...302/327/350..Camel hump, no accessory holes, 64cc chamber 3917292....68......327/350......Camel hump, 64cc chamber 3917293....67-68...307/327......75cc chamber 3927185....69-76...307/327/350..70cc chamber 3927186....69-70...302/350......Camel hump, 64cc chamber, accessory holes 3927187....69-70...350..........Camel hump, 64cc chamber, accessory holes 3927188....69......327..........74cc chamber 3927188....70......307..........74cc chamber 3931633....68-73...307 3931635....68-76...350 3931638....68......327..........Truck 3932441....69-70...350..........76cc chamber 3932441X...69-70...350/400......80cc chamber 3932454....69-73...307 3932454....69-79...350..........Truck 3946812....69......350 3946813....69-79...350..........Truck 3947040....68......327.........."Right angle" casting identifier, 64cc chamber, good HP head, used in trucks, no accessory holes 3947041....69-70...302/350......"Right angle" casting identifier, 64cc chamber, accessory holes, good HP head 3947041X...69-70...302/350......"Right angle" casting identifier, 64cc chamber, 165cc intake port, accessory holes, good HP head 3951598....70......400..........76cc chamber 3964286............350 3965742....70......350..........Over the counter, angle plug 3970126....67-71...327/350 3973370....69-70...350..........Over the counter in US, Canadian 350/300hp production use in Pontiac, 64cc, straight or angle plug 3973414....70......350..........LT1-350/370hp, camel hump, 64cc chamber 3973487....71-72...350..........1.94”/1.5” or 2.02”/1.6” valves, was also used on '71 350/330hp LT1, 75cc chamber 3973487X...71-72...350..........1.94”/1.5” or 2.02”/1.6” valves, 75cc chamber 3973493....71-72...400..........76cc chamber 3986316....71......350..........76cc chamber 3986336....71......350..........76cc chamber 3986336X...71......350..........76cc chamber 3986339....71......307/350......74cc chamber 3986339X...71......307/350......74cc chamber 3986388....68-76...307/350 3991492....70......350..........LT1, camel hump, accessory holes, 64cc, straight plug 3991492....70-up................Over the counter, camel hump, 64cc, straight or angle plug 3998916....72......350..........Also used w/'72 350 LT1, big valves, screw in studs, 76cc chamber 3998920....72-73...350 3998991....72-73...307/350......75cc chamber 3998993....72-73...307/350......75cc chamber 3998993....current..350.........Goodwrench crate motors, "Hecho en Mexico", 75cc chamber 3998997....72-73...350/400......76cc chamber 3998997....78-84...305/350......76cc chamber 4079261....75......350 10033867........................Aluminum , over the counter Pontiac 23º head, 62cc, angle plug, 196cc intake port 10045434........................Over the counter Pontiac 15º head, 55cc, angle plug, raised runner, aluminum, "roll over" head 10051101........................Bowtie, aluminum, 55cc, angle plug, raised runner, 196cc intake port 10065202...87-95...350..........Truck 10065203...87-95...350..........Truck 10065204...87-95...350 10065205...87-95...305 10065206...87-95...350 10065207...87-95...305 10088113...88-up...350..........Aluminum, 58cc, angle plug, raised "D"-port exhaust, 1.94"/1.5" valves 10093328........................Over the counter, Pontiac 15º head, aluminum, 224cc intake port, 61cc chamber, "roll over" head 10106178...90......350..........LT5, ZR1, DOHC, 32-valve, pass. side, aluminum 10106179...90......350..........LT5, ZR1, DOHC, 32-valve, drvs. side, aluminum 10110810...91-up...350..........Gen. 1, 65cc chamber 10120928...87-95...350 10125320...94-96...350..........Gen. 2 LT1, cast iron version, used on "9C1" Police package, Impala SS, Cadillac Fleetwood, Buick Roadmaster, reverse flow cooling 10128374...92-up...350..........Gen. 2 LT1, 53cc, angle plug, aluminum, reverse flow cooling, 175cc/68cc ports 10134352........................Bowtie, 45cc, angle plug, "low" port, 223cc intake port, aluminum, 18º race head 10134363........................NOTE: This casting # has been used in several different versions of aluminum 18º and 15º Bowtie race heads. Different chamber volumes, port volumes, port locations, valve sizes, etc. were used. Check this casting carefully to determine which features it may have. There are at least six different versions as of 11/99. 10147898...95-98...350..........Gen. 1 crate motor 10159550...87-95...350 10159551...87-95...305 10159552...87-95...350 10159553...87-95...305 10174389...91-94...350..........LT5, ZR1, DOHC, 32-valve, drvs. side, aluminum 10174390...91-95...350..........LT5, ZR1, DOHC, 32-valve, pass. side, aluminum 10185040........................Bowtie, aluminum, 45cc chambers, 1st. version, symmetrical ports, 263cc intake port, splayed valves 10185040........................Bowtie, aluminum, 45cc chamber, 2nd. version, symmetrical ports, 240cc intake port, splayed valves 10205245...93......350..........Gen. 2 LT1, aluminum, reverse flow cooling, 175cc/68cc port volumes 10207643...94-96...350..........Gen. 2 LT1, aluminum, reverse flow cooling, 175cc/68cc port volumes 10208890...94-96...265..........Gen. 2, L99, 4.3 Liter V8, cast iron, reverse flow 10215339...97......350..........Gen. 3, LS1, aluminum, 68cc 10225121...94-95...350..........LT5, ZR1, DOHC, 32-valve, drvs. side, aluminum 10225122...95......350..........LT5, ZR1, DOHC, 32-valve, pass. side, aluminum 10239902...96-up...350..........Gen. 2 LT4, aluminum, reverse flow cooling, 195cc port, 54.4cc chamber, angle plug 10239906...96-up...350.........."Vortec 5700", "L31", 64cc chamber, 170cc intake port, 1.94"/1.5" valves 12367712...99-up................"Fast Burn", aluminum, 210cc intake port, 2.00”/1.55” valves, 62cc chamber 12367713...99-up................"Fast Burn" used on ZZ430 crate motor, aluminum, 210cc intake port, 2.00”/1.55” valves, 62cc chamber 12480005...2000.................LS1 "GTZ", aluminum, 38cc chamber, 2.125"/1.625" valves, angle plug 12480011...97-up................Bowtie "SB2.2", aluminum, 2nd. version of "SB2", 48cc chamber, "mirror ports", revised valve angles & plug location 12506450...87-95...350 12509859...87-94...305 12516852...87-95...350 12529742...95-96...265..........Gen. 2, "L99", cast iron 12551561...96......350..........Gen. 2, "LT1", aluminum 12552520...97-up...305..........Vortec, truck 12554290...94-96...350..........Gen. 2, "LT1", cast iron version, used on "9C1" police package, Impala SS, Cadillac Fleetwood, Buick Roadmaster, reverse flow cooling 12554291...95-96...265..........Gen. 2, "L99", cast iron 12555690...96......350..........Gen. 2, "LT4", aluminum 12556743...99......325..........Gen. 3, 5.3L, aluminum, truck, van 12558059...97......305..........Vortec, truck, 1.84"/1.5" valves 12558062...98......350..........L31 Vortec, truck, 64cc chamber, 1.94”/1.5”, 170cc intake port 12558806...97-98...350..........Gen. 3, "LS1", aluminum, 68cc chamber 12559853...99-up...350..........Gen. 3, "LS1", aluminum, 68cc chamber 12559862...99-00................Gen. 3, aluminum 4.8/5.3L 12559895...00-up...325..........Gen. 3, aluminum, Vortec 5.3L 12561706...01-04................Gen. 3, 5.3L, aluminum 12561873...99-01...364..........Gen. 3, 71cc, iron 12562317...01-04...364..........Gen. 3, 71cc, aluminum 12564241...00-up...350..........Gen. 3, "LS1", aluminum, 68cc chamber 12564243...01-up...350/364......Gen. 3, "LS6", "LS2", aluminum 12572035...01-04...364..........Gen. 3, 6.0L, aluminum, 71cc chamber 14008856...79-81...267 14010201...82-85...305 14011034........................Bowtie, cast iron, 64cc chamber, 184cc intake port volume, angle plug, "Phase 2" head 14011049........................Bowtie, aluminum, 55cc chamber, angle plug, 180cc intake port volume, "Phase 6" 14011083...55-86...350..........Crate motor for years indicated. 285/300hp, 64cc chamber, 1.94"/1.5" valves 14014415...80-85...267/305 14014416...80-86...305..........1.84"/1.5" valves, 58cc chamber 14014440...80......305..........1.84"/1.5" valves 14019821...80-86...350 14019924...79-81...267 14019926...80-86...350 14010516...80-86...350 14020517...80......350 14020555...81......305 14020556...81......350 14022056...85......350 14022206...80......350 14022301...80-86...305 14022601...80-86...267/305......1.72"/1.5" or 1.84"/1.5" valves, 53cc chamber 14022801...80-86...305 14024816...........350..........76cc chamber, 1.94”/1.5” valves, Gen. 1 crate motor 14034806...78-82...267 14034807...78-86...305 14034808...80-86...350 14034808...96-up...350..........76cc chamber, 1.94"/1.5" valves, Gen. 1 Goodwrench crate motor 14034810...80-86...350..........Truck 14034811...80-86...350..........Truck 14039121...81-86...305..........Truck 14039122...81-86...305..........Truck 14071114...80-86...350 14075381...80-86...350..........Truck 14079261...86......350 14085844...80-86...350..........Truck 14085963...86......350 14088526...........350..........Gen. 2, LT1, aluminum 14089119...86-88...350 14094093...86-88...350 14096217...55-86...350..........Crate motor, 285hp/300hp, 64cc chamber, 72º or 90º center intake manifold bolt angles 14101081...87-95...305 14101083...87-up...350..........Gen. 1, also used on crate motors, 285 or 300 hp, 64cc chamber, 72º center manifold bolt angles 14101128...86-87...350..........Aluminum, 58cc, angle plug 14102187...87-91...305..........1.84"/1.5" valves 14102191...87-up...350 14102193...87-up...305/350......1.94"/1.5" valves 22542525........................Dart/Olds/Chevy aluminum, 14º or 17º race head 24502559...96-97................Bowtie, "SB2", 1st. version, "mirror ports", aluminum, 196cc port, CNC version 280cc port, 38cc chamber 25500141........................Buick/Chevy aluminum, 10º race head, 42cc chamber, symmetrical ports, 235cc intake port volume, 2.1"/1.625" valves 25534351C..04-up................Gen. 1 Bowtie, cast iron Vortec head, 175cc/65cc ports, 2.00”/1.55” valves, "small port” head 25534371C..04-up................Gen. 1 Bowtie, cast iron Vortec head, 206cc/77cc ports, 2.00”/1.55” valves, "large port” head 33417369...90-up...350..........Gen. 1 Goodwrench crate motor, "Hecho en Mexico", 76cc chamber </pre> ===Mortec BBC block casting numbers=== <pre>BIG BLOCK CHEVY BLOCK CASTING NUMBERS: NOTE: T = tall deck Oval includes both "peanut" (also called "round") ports and large oval ports 0-326711.....................4-bolt, alum., CanAm, 4.44" bores, steel cylinder liners 340220.....427T......68-85...4-bolt 345014.....454.......70-86... 346236.....454.......75-76...2-bolt 359070.....454.......70-90... 361959.....454.......73-90...2 or 4 bolt 364776.....427T......68-85...4-bolt 364779.....366T......68-90...4-bolt 399204.....509.......70-71...4-bolt, alum., CanAm, 4.5" bores, steel cylinder liners 399293.....366T......77-78...4-bolt 473478.....427T......77-90...4-bolt 495102.......................4-bolt, alum., CanAm, 4.5" bores 3782870....427T......68-76...4-bolt 3824553....366T......66-67...4-bolt 3855961....396.......65-66...2 or 4 bolt 3855961....427.......66......2-bolt 3855962....396.......65-66...4-bolt 3855977....366T......66-73...4-bolt 3869942....427.......66-67...2 or 4 bolt 3902406....396.......67......2 or 4 bolt 3904351....427.......67......2 or 4 bolt 3904354....366T......66-76...4-bolt 3916319....366T......68......4-bolt 3916321....427.......68......2 or 4 bolt 3916323....396.......68......2 or 4 bolt 3925521....427T......68-85...4-bolt 3935439....427.......68-69...2 or 4 bolt 3935440....396.......68-69...2 or 4 bolt 3937724....366T......68-85...4-bolt 3937726....427T......68-84...4-bolt 3946052....427.......69......4-bolt, alum. ZL-1, Mark IV 3946053....427.......97-up...4-bolt, alum. ZL1, 2nd. version, Mark IV 3955270....427.......69......2 or 4 bolt 3955272....396.......69......2 or 4 bolt 3955274....366T......68-85...4-bolt 3955276....427T......68-73...4-bolt 3963512....427.......69......2 or 4-bolt 3963512....454.......70-76...2 or 4-bolt 3969852....366T......68-84...4-bolt 3969854....396.......69......2 or 4-bolt 3969854....402.......70-72...2 or 4-bolt 3969858....427T......68-84...4-bolt 3999289....454.......71-79...2 or 4-bolt, some "CE" replacement blocks had four bolt main caps 3999290....396.......68-69...2 or 4-bolt, truck 3999290....402.......70-72...2 or 4-bolt, truck 3999290....402.......72......2 or 4 bolt, passenger car 3999293....366T......68-90...4-bolt 3999294....427T......68-84...4-bolt 10051107...454...............4-bolt, Bowtie, Mark IV, 9.8" deck, siamesed bores, 4.25" semi-finished bores, can be bored to 4.50" 10069282...366T......90-91...4-bolt, Mark IV, tall deck 10069284...427T..............4-bolt, Mark IV, tall deck 10069286...454.......90-91...4-bolt, Mark IV, short deck 10114182...454.......91-up...4-bolt, Gen. 5 10114183...366T......91-up...4-bolt, Gen. 5 10114184...427T......91-up...4-bolt, Gen.5 10134366...454T..............4-bolt, Bowtie, Gen. 5, tall deck 10185050...454...............4-bolt, Bowtie, Gen. 5, short deck 10237297...454.......96-up...4-bolt, Vortec 7400", "L-29" Gen. 6 10237299...427T......96-up...4-bolt, Gen. 6, 7.0L, truck 10237300...502.......96-up...4-bolt, Gen. 6, 4.466" bore 12550312...427T......96-up...4-bolt, Gen. 6, 4.250" bore, fuel pump boss, clutch linkage pivot boss 12550313...454.......91-up...4-bolt, Gen. 5 crate motor, Gen. VI 4.25" bare block, fuel pump boss 12556110...496.......01-up...4-bolt, Gen. 7, 8.1L, "Vortec 8100", truck 12561357...454.......96-up...4-bolt, Gen. 6 12561358...502...............4-bolt, Gen. 6 14015443...454.......87-90...2 or 4-bolt, Mark IV, truck, motorhome 14015445...454.......78-90...2 or 4-bolt 14044807...454T..............4-bolt, Bowtie, Mark IV, CNC prep, tall deck, 4.25" or 4.495" bores 14096859...502...............4-bolt, Gen. 5, HO 24502504...454...............4-bolt, Bowtie, Gen. 5, race prep, 9.8” "short" deck height 24502506...454T..............4-bolt, Bowtie, Gen. 5, race prep, 10.2” "tall" deck height 24502572.....................4-bolt, 4.5" bore Olds DRCE 2, 9.5" deck height 25534402.....................4-bolt, 4.590" bore Olds DRCE 3, 9.25" deck height </pre> ===Mortec BBC head casting numbers=== <pre>BIG BLOCK CHEVY HEAD CASTING NUMBERS: 330864.....68-84...oval...OPEN...396, 402, 366T, 427T, 454 Truck 330865.....68-84...oval...OPEN...396, 402, 366T, 427T, 454 Truck 330866.....68-78...oval...OPEN...366T, 427T 330867.....68-73...oval...OPEN...427T 336765.....68-78...oval...OPEN...427T 336768.....73-76...oval...OPEN...427T 336781.....73-85...oval...OPEN...454, 118cc chamber, 256cc/114cc ports 343771.....68-86...oval...OPEN...366T, 427T, 454 343772.....68-86...oval...OPEN...366T, 427T, 454 343783.....70-76...oval...OPEN...454 truck 346236.....75-87...oval...OPEN...454, 120cc chamber, 225cc/116cc ports 352625.....70-76...oval...OPEN...454 truck 353049.....73-84...oval...OPEN...454, 122cc chamber, 255cc/119cc ports 366765.....74-78...oval...OPEN...427T 473328.....68-69...oval...OPEN...366T 3856206....65-66...oval..CLOSED..396, 97cc chamber 3856208....65......rect..CLOSED..396/425hp, 109cc chamber 396/375hp "Z-16" Chevelle 3856213....66-82...oval..CLOSED..366T, 427T 3856260....68......oval..CLOSED..396 truck 3872702....65-66...oval..CLOSED..396, 427, 98cc chamber 3873858....65-67...rect..CLOSED..396, 427, 109cc chamber 3876875....77-85...oval...OPEN...427T 3904390....67......oval..CLOSED..396, 427, 98cc chamber 3904391....67......rect..CLOSED..396, 427, 107cc chamber 3904392....67......rect..CLOSED..427, aluminum, L88, L89, 107cc chamber 3904393....68-76...oval...OPEN...366T 3908952....67......oval...OPEN...427, truck, marine 3909802....67......oval..CLOSED..396, 427, 101cc chamber 3917215....67-68...oval..CLOSED..396, 427, 101cc chamber 3917219....68-85...oval...OPEN...366T, 427T 3919840....67-69...rect..CLOSED..396, 427, 107cc chamber 3919842....68-69...rect..CLOSED..396, 427, aluminum L88, L89, 107cc chamber 3931063....68-69...oval..CLOSED..396, 402, 427, 101cc chamber 3933148....69-84...oval...OPEN...'69 396/265hp, 366T, 427T, 112cc chamber 3933149....68-76...oval...OPEN...427T, 122cc chamber 3935401....68-76...oval...OPEN...427T 3946074....69&71...rect...OPEN...'69 427 L88, ZL1, aluminum, 118cc chamber, '71 454 LS6, "round exhaust port" 3964290....69-70...oval..CLOSED..396, 402, 427, 454, 101cc chamber, large or small hex spark plugs used 3964291....69-72...rect..CLOSED..396, 402, 427, 454, 109cc chamber, large or small hex spark plugs used, crate motor usage in years after 1970 3965198....68-69...oval..CLOSED..396 truck 3975950....68-70...oval...OPEN...396, 402 Truck, 366T, 427T 3986133....68-85...oval...OPEN...366T, 427T, 454 truck 3986135....69-73...oval...OPEN...366T, 427T 3986136....68-84...oval...OPEN...366T, 427T, 454 truck 3993820....71......oval...OPEN...402, 113cc chamber, 255cc/114cc ports 3993820....71-84...oval...OPEN...454 passenger and trucks, 113cc chamber, 255cc/114cc ports 3994026....71......rect...OPEN...454 LS6, 118cc chamber 3999241....72......oval...OPEN...402, 454, 113cc chamber 6272292....70-78...oval...OPEN...402, 454 6272990....70-up...rect...OPEN...454 service replacement, used on some Mark IV crate engines, 118cc chamber 10045427...........rect..........Pontiac/Chevy, aluminum, 91cc chamber, large port, race 10049875...........rect..........Pontiac/Chevy, aluminum Small port, race 10051128...........rect..........Bowtie, aluminum, 72cc chamber, symmetrical ports 10051129...........rect..........Bowtie, aluminum "raw" casting, symmetrical ports 10052902...........oval...OPEN...Mark IV, 427T 10101140...91-up...oval..CLOSED..Gen. 5 366T, 427T 10114156...91-up...oval...OPEN...Gen. 5 & 6 454, 118cc chamber 10141279...96-up...oval..CLOSED.."Vortec 7400", 100cc chambers 10487052...77-90...oval...OPEN...366T 12363391...96-up...oval...OPEN...Bowtie, aluminum, Signature Series, fits Mark IV, Gen. 5, Gen. 6, 110cc chamber 12363401...96-up...rect...OPEN...Bowtie, aluminum, Signature Series, fits Mark IV, Gen. 5, Gen. 6, 118cc chamber 12558162...01-up...oval..CLOSED..Gen. 7, "Vortec 8100", 8.1L, 496, truck 12560241...98-up...oval..CLOSED.."Vortec 7400", 100cc chamber 12562932...91-95...oval...OPEN...Gen. 5, truck crate motor, 118cc chamber 12562933...91-95...oval...OPEN...Gen. 5, 118cc chamber 12562934...00-up...rect...OPEN...Gen. 6, 502 marine 14011077...69-up...rect...OPEN...aluminum, fits Mark IV, "C-port", 118cc chamber, also sold as a "solid" head 14044861...84-96...rect..........Bowtie, aluminum, Mark IV, "raised runner", 1st. design, 105cc chamber 14044861...96-up...rect..........Bowtie, Aluminum, Signature Series, fits Mark IV, Gen. 5, Gen. 6, "raised runner", 2nd. design, 115cc chamber 14044861...84-96...rect..........Bowtie, aluminum, Mark IV, "raw" casting of "861" Mark IV 1st. design 14081045...78-87...oval...OPEN...454 14081052...85-87...oval...OPEN...366T, 427T, 454 Truck, marked "HiPerf" 14092359...86-90...oval...OPEN...366T, 427T, marked "HiPerf" 14092360...86-90...oval...OPEN...454 truck, "peanut" round ports 14096188...70-71...rect...OPEN...454 service replacement, also used on later Mark IV LS-6, LS-7 and 454 HO crate motors, 116cc chamber 14097088...91-up...rect...OPEN...Gen. 5, 454/502 HO, 118cc chamber 24502585...97......rect..........Olds/Chevy, DRCE 2, Pro Stock aluminum, for blocks w/4.900" bore spacing 25534404...04......rect..........Olds/Chevy, DRCE 3, Pro Stock, aluminum, for blocks with 4.900" bore spacing </pre> ===Other Mortec info=== <pre>CHEVY SMALL BLOCK CRANKSHAFT CASTING NUMBERS: WITH 2-PIECE REAR MAIN OIL SEAL 1130.......327.......forged..medium journal...3.25" stroke 1178.......302.......forged..medium journal...3.00" stroke 1181.......305,350...cast....medium journal...3.48" stroke 1182.......350.......forged..medium journal...3.48" stroke 2680.......327.......forged..small journal....3.25" stroke 2690.......350.......forged..medium journal...3.48" stroke 3279.......302.......forged..medium journal...3.00" stroke 3474.......283.......forged..small journal....3.00" stroke, military tank use 4577.......327.......forged..small journal....3.25" stroke 4672.......327.......forged..medium journal...3.25" stroke 310514.....350.......cast....medium journal...3.48" stroke 330550.....350.......cast....medium journal...3.48" stroke 354431.....262.......cast....medium journal...3.10" stroke 3727449....283.......forged..small journal....3.00" stroke 3729449....265.......forged..small journal....3.00" stroke 3734627....327.......forged..small journal....3.25" stroke 3735236....265,283...forged..small journal....3.00" stroke 3735263....283.......forged..small journal....3.00" stroke 3782680....327.......forged..small journal....3.25" stroke 3814671....327.......forged..small journal....3.25" stroke 3815822..265,283,302.forged..small journal....3.00" stroke 3835236....283.......forged..small journal....3.00" stroke 3836266....283.......forged..small journal....3.00" stroke 3848847....283.forged or cast..sm. journal....3.00" stroke 3849847....283.......forged..small journal....3.00" stroke 3876764....283.forged or cast..sm. journal....3.00" stroke 3876768....283.......forged..small journal....3.00" stroke 3884577....327.......forged..small journal....3.25" stroke 3892690....350.......forged..medium journal...3.48" stroke 3911001....307,327...cast....medium journal...3.25" stroke 3911011....307,327...cast....medium journal...3.25" stroke 3914672....327.......forged..medium journal...3.25" stroke 3923279....302.......forged..medium journal...3.00" stroke 3932442..267,305,350..cast...medium journal...3.48" stroke 3941174....307,327...cast....medium journal...3.25" stroke 3941178....302.......forged..medium journal...3.00" stroke 3941182....350.......forged..medium journal...3.48" stroke 3941188....350.......forged..medium journal...3.48" stroke 3949847....283..forged or cast..small journal...3.00" stroke 3951130....327.......forged..medium journal...3.25" stroke 3951529....400.......cast....large journal....3.75" stroke WITH 1-PIECE REAR MAIN OIL SEAL 10168568...265.......cast....medium journal...3.00" stroke 12552215...364.......cast....medium journal...3.62" stroke, Gen. 3, 6.0L 12552216...325,350,364.......cast....medium journal...3.62" stroke, Gen. 3 5.7L LS1, 5.3L, 6.0L 12553312...293.......cast....medium journal, 3.27" stroke, Gen. 3, 4.8L 12553482...293.......cast....medium journal, 3.27" stroke, Gen. 3, 4.8L 14088526...305,350...cast....medium journal...3.48" stroke 14088532...350.......forged..medium journal...3.48" stroke 14088535...305,350...cast....medium journal...3.48" stroke 14088552...350.......forged..medium journal...3.48" stroke ZR1, "LT5", 350 DOHC 10106122...350.......forged..large 2.76" journal...3.66" stroke CHEVY BIG BLOCK CRANKSHAFT CASTING NUMBERS: 3.76" STROKE WITH 2-PIECE REAR MAIN OIL SEAL Used on '65-'90 Mark IV 366T, 396, 402, 427 and 427T 6223.......396,402,427...forged, 1053 steel 7115.......396,402,427...forged, nitrided, cross-drilled, 5140 steel 3804816....396,402,427...cast 3856223....396...forged 3863114....402... 3863144....396,402... 3874874....396,402... 3879621....427...forged 3882841....396...forged, cross drilled, nitrided 3882842....427...forged, cross drilled, nitrided 3882847.... 3882848.... 3882849....427...forged 3887114....396...forged, nitrided, 5140 steel 3904815....396,402...cast, nodular iron 3941180.... 3942411.... 3965746..........semi- finished, forged 3993804..........raw, 5140 steel 3.76" STROKE WITH 1-PIECE REAR MAIN OIL SEAL Used on '91-up Gen. 5 and Gen. 6, 366T, 427T 10114186...427T...forged, 1053 steel 10114187...366T...cast 10114189...427T...cast 4.00" STROKE WITH 2-PIECE REAR MAIN OIL SEAL Used on '70-90 Mark IV 454 or Mark IV 502 3520.......454...forged, cross-drilled, 1053 steel 3521.......454, 502...forged, cross-drilled, 5140 steel 3524.......454...forged 7416.......454, 502...forged, cross-drilled, 1053 steel 7463.......454...forged 336782.....454...cast 353039.....454...cast 353638.....454... 359730.....454... 3962523....454...forged 3963523....454... 3963524....454...forged 3967416....454...forged 3967463....454...forged 3975945....454 3963521....454...forged, cross drilled, 5140 steel 3965753..........semi-finished, forged, 5140 steel 3975495....454 3993878....454...forged 10051169...454...forged raw casting 4.00" STROKE WITH 1-PIECE REAR MAIN OIL SEAL Used on '91-up Gen. 5 and Gen. 6 454 or 502 10114188...454......cast 14097044...454, 502..forged, 1053 steel 348/409/427 W-ENGINE BLOCK CASTING NUMBERS: 3732755.....348......59-61 3732811.....348......58 3751872.....348......58 3755011.....348......59-61 3771705.....348......59-61 3782012.....348......58-61 3788068.....409......62-63 3795623.....409......61 3798962.....348......62-65...truck 3815707.....348......58-61 3830814.....427......63......"Z11" (4.312" bore x 3.65" stroke) 3830814.....409......63-64 3839752.....409......62-63 3839754.....409......65 3844422.....409......63-65 3857655.....348......62-65...truck 3857656.....409......64-65 3860386.....409......62-64 3860387.....348......58 348/409/427 W-ENGINE HEAD CASTING NUMBERS: 3732791.....348......58-60 3758379.....348......59-61...250 hp 3759256.....348......58 3759332.....348......58-60 3764702.....348......60......truck 3767738.....348......59-60...250 hp 3781147.....348......60-61...HiPerf, 2.06"/1.72" valves 3781173.....348......60......1.94"/1.66" valves 3795586.....348/409..61......HiPerf, 2.06"/1.72" valves 3814690.....409......62-63...HiPerf, 2.19"/1.72" valves 3815643.....348/409..58-62...truck, industrial 3815857.....348/409..58-62...truck 3819333.....348/409..62-65...HD Truck 3830817.....409......63-65...340 hp 3837731.....427......63......"Z11" (4.312" bore x 3.65" stroke) 3852583.....409......63-65...HiPerf, 2.19"/1.72" valves CHEVY 348/409/427 W-ENGINE CRANKSHAFT CASTING NUMBERS: 3732692...348...forged...3.25" stroke 3733223...348...forged...3.25" stroke 3733226...348...forged...3.25" stroke 3741640...348...forged...3.25" stroke 3741642...348...forged...3.25" stroke 3788072...409...forged...3.50" stroke 3795589...409...forged...3.50" stroke 3824553...348...forged...3.25" stroke 3829027...409...forged...3.50" stroke 3837466...409,427 "Z11"...forged...3.65" stroke 3838416...409...forged...3.50" stroke CHEVY SMALL BLOCK BORE AND STROKE 262 = 3.671" x 3.10" (Gen. 1, 5.7" rod) 265 = 3.750" x 3.00" ('55-'57 Gen. 1, 5.7" rod) 265 = 3.750" x 3.00" ('94-'96 Gen. 2, 4.3 liter V8 "L99", 5.94" rod) 267 = 3.500" x 3.48" (Gen. 1, 5.7" rod) 283 = 3.875" x 3.00" (Gen. 1, 5.7" rod) 293 = 3.779" x 3.27" ('99-later, Gen. 3, "LR4" 4.8L Vortec, 6.278" rod) 302 = 4.000" x 3.00" (Gen. 1, 5.7" rod) 305 = 3.736" x 3.48" (Gen. 1, 5.7" rod) 307 = 3.875" x 3.25" (Gen. 1, 5.7" rod) 325 = 3.779" x 3.622" ('99-later, Gen. 3, "LM7", "LS4 front wheel drive V8" 5.3L Vortec, 6.098" rod) 327 = 4.000" x 3.25" (Gen. 1, 5.7" rod) 345 = 3.893" x 3.622" ('97-later, Gen. 3, "LS1", 6.098" rod) 350 = 4.000" x 3.48" (Gen. 1, 5.7" rod) 350 = 4.000" x 3.48" ('96-'01, Gen. 1, Vortec, 5.7" rod) 350 = 3.900" x 3.66" ('89-'95, "LT5", in "ZR1" Corvette 32-valve DOHC, 5.74" rod) 364 = 4.000" x 3.622" ('99-later, Gen. 3, "LS2", "LQ4" 6.0L Vortec, 6.098" rod) 376 = 4.065" x 3.622" (2007-later, Gen. 4, "L92", Cadillac Escalade, GMC Yukon) 383 = 4.000" x 3.80" ('00, "HT 383", Gen. 1 truck crate motor, 5.7" rod) 400 = 4.125" x 3.75" (Gen. 1, 5.565" rod) 427 = 4.125" x 4.00" (2006 Gen. 4, LS7 SBC, titanium rods) Two common, non-factory small block combinations: 377 = 4.155" x 3.48" (5.7" or 6.00" rod) 400 block and a 350 crank with "spacer" main bearings 383 = 4.030" x 3.75" (5.565" or 5.7" or 6.0" rod) 350 block and a 400 crank, main bearing crank journals cut to 350 size CHEVY BIG BLOCK V8 BORE AND STROKE 366T (tall deck) = 3.935" x 3.76" 396 = 4.096" x 3.76" 402 = 4.125" x 3.76" 427 = 4.250" x 3.76" 427T (tall deck) = 4.250" x 3.76" 454 = 4.250" x 4.00" 496 = 4.250" x 4.37" (2001 Vortec 8100, 8.1 liter) 502 = 4.466" x 4.00" 572T (tall deck) = 4.560" x 4.375" (2003 "ZZ 572" crate motor) ALL production big blocks used a 6.135" length rod. CHEVY 348-409 V8 BORE AND STROKE 348 = 4.125" x 3.25" (6.125" rod) 409 = 4.312" x 3.50" (6.010" rod) 427 = 4.312" x 3.65" (6.135" rod), 1963 "Z11" SHP drag race CHEVY SMALL BLOCK CRANKSHAFT JOURNAL SIZES Gen. 1, "Small Journal" 265...Mains- 2.30", Rods- 2.00" 283...Mains- 2.30", Rods- 2.00" 302...Mains- 2.30", Rods- 2.00" 327...Mains- 2.30", Rods- 2.00" Gen. 1, "Medium Journal", includes Vortec 305 and 350 through '98 262...Mains- 2.45", Rods- 2.10" 267...Mains- 2.45", Rods- 2.10" 302...Mains- 2.45", Rods- 2.10" 305...Mains- 2.45", Rods- 2.10" 307...Mains- 2.45", Rods- 2.10" 327...Mains- 2.45", Rods- 2.10" 350...Mains- 2.45", Rods- 2.10" Gen. 1, "Large Journal" 400...Mains- 2.65", Rods- 2.10" Non-production Gen. 1 combination using Gen. 1 400 crank in Gen. 1 350 block 383...400 crank, Mains cut to 2.45", Rods- 2.10" Non-production Gen. 1 combination, using Gen. 1 350 crank in Gen. 1 400 block 377..."Spacer" or "thick" main bearings with 350 crank, Rods- 2.10" Gen. 2, "Medium Journal", includes "L-99" 265, "LT1" 350, "LT4" 350 265...Mains- 2.45", rods-2.10" 305...Mains- 2.45", Rods-2.10" 350...Mains-2.45", Rods-2.10" Non-production Gen. 2 combination, using Gen. 2 265 "L-99" crank in Gen. 2 350 block 302...Mains- 2.45", Rods- 2.10" Gen. 3, includes '97-2005 "LS1" Corvette, Firebird, Camaro 345...Mains- 2.558", Rods- 2.10" Corvette "ZR1", DOHC, "LT5" 350...Mains- 2.76", Rods- 2.10" CHEVY BIG BLOCK CRANKSHAFT JOURNAL SIZES 366T 396 402 427 427T 454 502 ALL Chevy big blocks used Mains- 2.7488"-2.7495", Rods- 2.20" CHEVY W-ENGINE CRANKSHAFT JOURNAL SIZES 348 409 427 Z-11 All W-motors used Mains- 2.50", Rods- 2.20" </pre> [[Category:Identification and decoding]] [[Category:Engine]] [[Category:GM]]

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