I went to the track with Vince and even swapped my carb from my car onto his engine, ran almost exacty the same. I drove his car down the track, and it just doesn't "pull" like it should. There is a pretty good "rush" of power up near 4500rpm's, but it is lacking some below that, and even above 4500 it isn't as strong as it should be?
My guess is that the static compression ratio is quite a bit lower than it needs to be for that big of a camshaft. We've cc'd #13 heads that were up near 78cc. If the pistons are .020-.030" in the holes, combined with 75cc or so heads, the static compression ratio is pretty "low".
We tried timing and fuel, and the engine didn't respond to either one. Could have been partly due to the high octane fuel, it sure wasn't helping much? I know a few folks running very similiar combinations of parts, and running into the 11's, but they are using cams in the 230-240 range. This would probably be the best place to start, FWIW......Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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