Identifying Chevy engines
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===SBC engine casting numbers=== | ===SBC engine casting numbers=== | ||
| − | {{Note1}} The Mortec site is no longer available | + | {{Note1}} The Mortec site is no longer available. The Mortec casting number info is listed at the [[Identifying Chevy engines #Mortec|'''bottom of this page''']]. |
*[http://outintheshop.com/faq/casting/castings2.html Chevy BB and SB casting number "go-to" site] from outintheshop.com | *[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.nastyz28.com/sbchevy/sblock.html smallblock info] from nastyz28.com | ||
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[[File:Sbc400balancer.jpg|thumb|300px|left|OEM 400 balancer. Note scalloped outer ring]] <br style="clear:both"/> | [[File:Sbc400balancer.jpg|thumb|300px|left|OEM 400 balancer. Note scalloped outer ring]] <br style="clear:both"/> | ||
| − | + | ==BBC== | |
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| + | ===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. | 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"/> | [[File:Bbc 454 damper.jpg|thumb|left|500px|BBC 454 balancer with inner ring scalloped]] <br style="clear:both"/> | ||
| − | ==BBC notched bores== | + | ===BBC notched bores=== |
A BBC block may have bores notched to clear the intake valves. Not present on all BBC engines. | 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"/> | [[File:BBC 454 BLOCK NOTCHED BORES.jpg]] <br style="clear:both"/> | ||
| − | ==BBC external cues for 2- or 4-bolt bottom end== | + | ===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: | 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"/> | [[File:Bbc 4-bolt vs 2-bolt fittings id.jpg|550px]] <br style="clear:both"/> | ||
| − | ==Tall deck BBC== | + | ==396 block boring== |
| − | The 10.2" deck height tall deck 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 | + | 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". |
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| + | {{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. | ||
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| + | ===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. | 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. | ||
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