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#1
01-31-2026, 01:13 PM
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You did not say what your Bore size, but I calculated your compression at both a standard bore and .030” over .
In these results I assumed a deck clearance of .020” and a head gasket volume of 9.4 CCs as in a Fel Pro 1016 gasket, and a chamber volume of 96 CCs a long with 1.5 CCs for top ring land volume. At a 4.150” bore 8.9 to 1. At 4.180” 8.93 to 1. If you mill the heads .030” which is very safe and will still allow the Intake to bolt up with out an issue, here is what you have . 4.150” 9.3 to 1. 4.180”. 9.35 to 1. With your rear gears I would run the Butler cam as with stock heads there no sence to stuffing in more lift then that.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#2
01-31-2026, 01:52 PM
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If a head has max flow at .400 lift is it detrimental to run a cam with.600 lift?
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007 (cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD 1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.45 @ 88.1 mph on slippery street tires.Bad 2.19 60ft.Owned since 86' |
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#3
02-04-2026, 02:00 PM
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