OK why don't we look at an UD 288/296 that has similar specs. Bullet and Lunati still can grind them on what ever lobe sep you want, so maybe a good choice too with similar specs. I've got multiple dyno pulls in a 400 and a 455 where it doesn't lay down at 4900! Lee Atkinson's old early Bird ran mid to low 11s with it, that was not a high compression engine. So we can keep the same specs basically (231/239) and have alot of data from lots of guys including the Butlers that used that cam.
One thing I find interesting it seem the cam gets the blame for the rpm limitations and no mention of the head. Almost all the formulas for rpm peak use the head CSA or other numbers for an rpm prediction. We're asking a 215-230 cfm iron head to feed 455-470 ci and wonder why the rpm is limited?? In fact just last night was talking to a well know Pontiac "stocker" that using PORTED D ports on a 455 SS cat they were building was head limited.
FWIW one of our west Texas Pontiac guys has had good luck with the Comp XE 274 and the 284 in some pretty fast Pontiacs, but then his cars go pretty fast regardless of what he has in them.
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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune [email protected]
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
1964 Corvette Coupe 327 4 speed
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