[GTOLou]

Originally Posted by 71 T/A

GTO Lou, what times did you run with the HR288 cam?

I've got that cam in a street 76 TA - haven't run it in that. When it was in my 69 GTO, 474 fastest 1/8's were in the 7.6-7.7 range w/ 95-96 mph. I always left HP on the table - my MPH always predicted a better et than I actually got. Heavy gto, four speed, plus - I'm a weekender doing this for fun. My 60 foot times rarely got under 1.9 (1.86 fastest?).

[Skip Fix]

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.