Quote:
Originally Posted by b-man
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. |
I plan on checking the timing first, but I cant see that the timing is so far off to make a different. The car has started and drove extremely well for 2 years and almost 3k miles without a hiccup, I drive it everywhere. The guy in the example had those heads ported, mine are not are are likely 190-200cfm.