Quote:
Originally Posted by Skip Fix
My port matched cleaned up HO intake made 420 easily on my old 455. It was the cork on my roller cammed E head 4 though.
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Skip ,I apologize for the confusion. Guess I should have made it a lot clearer. The HO as well as the RA 4/5 intakes flows better than the "run of the mill " Pontiac cast iron units. There's information being circulating that non RA , HO or any Pontiac " special " intakes are making 500hp. Not to say it can't be done, just never heard of the combination of parts. Many years ago I contacted Jim Taylor/ Erney of Scientex about one of their TFX solid ft cam
We installed a 244/244@0.050 cam with .520 lift in a 455 74 GTO , using the 74 GTO #98cc heads, Marty Warden ported intake to 240 cfm, installing 2.11/1.77 valves. Degreeing the cam per Jim's instructions. The car had 8.5 rear and a 4 speed Muncie, shifting @54-5600
I initially tried a stock 69 GTO intake adapter to use the 800 spread bore Holley . The best 1/8 mile time was 7.9_8.0. Changing nothing but the intake to an RPM, the car went 7.4s. All runs were done with an MSD ignition system with 3400 total @ 3k rpm. Used 3 tube headers We could never get the stock intake to perform better
I didn't dyno or weigh the car.