Quote:
Originally Posted by Bruce Meyer
He might be a great guy but he is wrong. I ran a bigger cam than you 239/247 @.050 with 8.5:1 compression on a 455 and it ran 12.70. It launched hard. My guess is your ignition timing is way off. Get that straightened out before you spend a bunch of money. Also there is nothing wrong with 96 heads. I guy I know went in the 11,s with them on a street car.
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Agreed.
Another low-compression 455 with an even bigger cam (244 / 252 @ .050 8.6:1 compression) running 12.0s, could easily have been high-11s in more favorable weather.
https://forums.maxperformanceinc.com...5&postcount=19
Surely some basic tuning should wake your combo up. Easy to visually check for full-throttle with the air cleaner off, get your wife or a friend to mash on the pedal while you look.
Get a good timing light and check for total advance with the vacuum hose disconnected and plugged, you should be somewhere in the 32 to 38 degree range. When I was first sorting out my bracket 455 was conservatively timed at 30 degrees, when I bumped the timing up to 38 it picked up at least 4 tenths.
No way will those #96 heads give you less than 9:1 compression, your 9.3 number is pretty close and even 9.5 isn’t too far fetched.