Pontiac V8 engine
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==Heads== | ==Heads== | ||
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===6X heads=== | ===6X heads=== | ||
Casting 6X heads and similar heads from the "smog era" generally all have hardened exhaust seats, screw-in rocker studs and guide plates, with 2.11" intake x 1.66" exhaust valves. See [http://www.pontiacstreetperformance.com/psp/6XheadID.html '''''How to Identify Pontiac's Small Chambered 6X Head'''''] for more info on ID'ing 6X heads. | Casting 6X heads and similar heads from the "smog era" generally all have hardened exhaust seats, screw-in rocker studs and guide plates, with 2.11" intake x 1.66" exhaust valves. See [http://www.pontiacstreetperformance.com/psp/6XheadID.html '''''How to Identify Pontiac's Small Chambered 6X Head'''''] for more info on ID'ing 6X heads. | ||
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A dual pattern cam like Comp Cams' XE series or a Lunati Voodoo would be good cams to look into. For info on Comp Cams XE series of cams you can contact Butler Performance for good solid info. For info on Crower cams contact Kauffman Racing Engines or Spotts Performance. These shops can be contacted via phone or email. | A dual pattern cam like Comp Cams' XE series or a Lunati Voodoo would be good cams to look into. For info on Comp Cams XE series of cams you can contact Butler Performance for good solid info. For info on Crower cams contact Kauffman Racing Engines or Spotts Performance. These shops can be contacted via phone or email. | ||
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==Intakes== | ==Intakes== | ||
With the D-port heads, unless they've been heavily ported, an RPM intake is a good choice. It will hit harder off idle and gives up nothing to a single plane at the modest peak rpm the 455 is going to be turning (5000-5500 rpm in street trim), built as described here; harnessing the torque by using sticky drag radial tires will give the maximum all-around performance. There might be an argument made for a single plane to "tame the torque". But that might be better left until all other avenues have been exhausted. | With the D-port heads, unless they've been heavily ported, an RPM intake is a good choice. It will hit harder off idle and gives up nothing to a single plane at the modest peak rpm the 455 is going to be turning (5000-5500 rpm in street trim), built as described here; harnessing the torque by using sticky drag radial tires will give the maximum all-around performance. There might be an argument made for a single plane to "tame the torque". But that might be better left until all other avenues have been exhausted. | ||
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===Heat cross over=== | ===Heat cross over=== | ||
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[[File:PONT HEAT X-OVER BLOCK-OFF 005.jpg|thumb|300px|left|Heat riser block off schematic]] <br style="clear:both"/> | [[File:PONT HEAT X-OVER BLOCK-OFF 005.jpg|thumb|300px|left|Heat riser block off schematic]] <br style="clear:both"/> | ||
[[Pontiac V8 engine #Parts interchangeability|Return to Parts interchangeability]] | [[Pontiac V8 engine #Parts interchangeability|Return to Parts interchangeability]] | ||
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==Pistons== | ==Pistons== | ||
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|[[File:8 vr pont.jpg|thumb|450|center|8 valve relief rebuilder-type piston, undesirable for high performance use]] | |[[File:8 vr pont.jpg|thumb|450|center|8 valve relief rebuilder-type piston, undesirable for high performance use]] | ||
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==Rods== | ==Rods== | ||
There are now inexpensive, good quality Pontiac rods. Years ago all that was available were high dollar rods like Various aluminum rods, then Miller, etc. or the weak factory forged rods or weak factory cast rods. Neither the cast or forged production Pontiac rod is a good choice if the engine will see hard use or high rpm. At a bare minimum, cast rods need to be resized and ARP hardware installed, and the rpm has to be kept under 5500 rpm (455) or 5800 rpm (400). | There are now inexpensive, good quality Pontiac rods. Years ago all that was available were high dollar rods like Various aluminum rods, then Miller, etc. or the weak factory forged rods or weak factory cast rods. Neither the cast or forged production Pontiac rod is a good choice if the engine will see hard use or high rpm. At a bare minimum, cast rods need to be resized and ARP hardware installed, and the rpm has to be kept under 5500 rpm (455) or 5800 rpm (400). | ||
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==Cranks== | ==Cranks== | ||
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{{Note1}} Pre-'64 cranks are not machined for TH-type torque converter hubs. They can be machined to fit, though. | {{Note1}} Pre-'64 cranks are not machined for TH-type torque converter hubs. They can be machined to fit, though. | ||
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===Pilot bearing=== | ===Pilot bearing=== | ||
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==Timing covers== | ==Timing covers== | ||
The following is from [http://forums.highperformancepontiac.com/70/6720258/the-general-discussion/water-pumps/#ixzz23bpSfjpr High Performance Pontac forums]: | The following is from [http://forums.highperformancepontiac.com/70/6720258/the-general-discussion/water-pumps/#ixzz23bpSfjpr High Performance Pontac forums]: | ||
| − | <blockquote>All of the timing chain covers from 1964 to 1979 will bolt up and interchange with any motor from those years. However, you must use the matching water pump, pulley and crank pulley to avoid alignment problems with the alternator and/or power steering pump. All of the water pumps from '64-'68 will interchange. These pumps have eight bolts and measure 3-5/8" long (from base to water pump pulley flange). The casting number for '64-'65 is 9772716 and for '66-'68 it is 4782482. The matching pulleys are 2" in height. From '64-'67 Pontiac used a small diameter (5.25") six bolt two-piece harmonic damper and from '68-'79 a large diameter (6.75"), four bolt one-piece damper was used. In '69 Pontiac changed to an 11-bolt water pump but the early '69 was different from late '69-on. Many early '69 Firebirds and GTOs used a pump that measured 4" long (casting #9796351) and the pulley was 2-1/4" in height. From late '69 to '79 only one pump style was used, it measured 4-1/2" long and there are at least two different casting numbers used: 482138 and 488296. The matching pulley should measure 2-5/8" in height. Always use the correct diameter and style crank pulley to match the water pump pulley and also use the same series timing chain cover and balancer to properly line up your timing marks. The same timing chain cover was used for both '64 and '65 and had just a simple pointer. These were cast with number 9773371. The timing cover used on '66 and '67 employed a small timing scale marked -4-0-+6 and is otherwise identified as casting #9783130. The '68, '69 and '70 timing covers look very similar with timing marks of 0-6-12 degrees BTDC and accommodated the large diameter damper. The '68 timing cover casting number is 9790347 and uses the 8-bolt water pump. The '69-'70 timing cover casting number is 9796346 and uses the improved 11-bolt pump. For '71-up the timing cover timing tab is marked from 4 degrees ATDC to 12 degrees BTDC and is graduated all the way to 16 degrees BTDC. As compression ratios were lowered to 8:1 and less there became a need for increased initial advance. Casting number for this cover is 482883. If you need to order a water pump the Federal Mogul part numbers are: '64-'68 is FP1388N, early '69 is FP1409N and late '69-on is FP1423. | + | <blockquote>All of the timing chain covers from 1964 to 1979 will bolt up and interchange with any motor from those years. However, you must use the matching water pump, pulley and crank pulley to avoid alignment problems with the alternator and/or power steering pump.<br><br> |
| + | All of the water pumps from '64-'68 will interchange. These pumps have eight bolts and measure 3-5/8" long (from base to water pump pulley flange). The casting number for '64-'65 is '''9772716''' and for '66-'68 it is '''4782482'''. The matching pulleys are 2" in height.<br><br> | ||
| + | From '64-'67 Pontiac used a small diameter (5.25"), six bolt two-piece harmonic damper and from '68-'79 a large diameter (6.75"), four bolt one-piece damper was used. In '69 Pontiac changed to an 11-bolt water pump but the early '69 was different from late '69-on. Many early '69 Firebirds and GTOs used a water pump that measured 4" long (casting #'''9796351''') and the pulley was 2-1/4" in height. From late '69 to '79 only one pump style was used, it measured 4-1/2" long and there are at least two different casting numbers used: '''482138''' and '''488296'''. The matching pulley should measure 2-5/8" in height. Always use the correct diameter and style crank pulley to match the water pump pulley and also use the same series timing chain cover and balancer to properly line up your timing marks.<br><br> | ||
| + | The same timing chain cover was used for both '64 and '65 and had just a simple pointer. These were cast with number '''9773371'''. The timing cover used on '66 and '67 employed a small timing scale marked -4-0-+6 and is otherwise identified as casting #'''9783130'''. The '68, '69 and '70 timing covers look very similar with timing marks of 0-6-12 degrees BTDC and accommodated the large diameter damper. The '68 timing cover casting number is '''9790347''' and uses the 8-bolt water pump. The '69-'70 timing cover casting number is '''9796346''' and uses the improved 11-bolt pump. For '71-up the timing cover timing tab is marked from 4 degrees ATDC to 12 degrees BTDC and is graduated all the way to 16 degrees BTDC. As compression ratios were lowered to 8:1 and less there became a need for increased initial advance. Casting number for this cover is '''482883'''. If you need to order a water pump the Federal Mogul part numbers are: '64-'68 is FP1388N, early '69 is FP1409N and late '69-on is FP1423. | ||
</blockquote> | </blockquote> | ||
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==Cooling system== | ==Cooling system== | ||
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