Ok new message still regarding cams

[WickEdSix9838]

<blockquote>quote:</font><hr> LT1's also have reverse cooled heads. Again, the cooler heads prevent detonation which will allow a higher compression ratio.
As far as having the cam bleed off compression, isn't that defeating the purpose of running high compression?
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static compression would still be 12:1 but the dynamic compression would be lower so that you could run pump gas, it probably wouldnt run as good as 12:1 dynamic compression but it would be better than a lower static/dynamic compression...do some searches on the Engine Masters Challenge in popular hot rodding, most of the guys ran atleast 11.5:1, some of the main rules were they had to be less than 360 cubic inches, all small blocks(mopar, ford, chevy, pontiac, olds) they had to run on 92 octane pump gas, they motors were to be judged on the average torque and horsepower between 2500-6500 rpms, the winner made like 604hp and 5xx torque...i think he was running around 12:1 static compression...

[phoenix64]

Lt1's do it with cams that bleed off pressure. Do a compression test on an LT1 and you will see. 10.5:1 only pulls about 130psi of cilinder pressure. That aint much. You could run 16:1 on 87 octane with the right cam.

[pvtschultz]

The cam will bleed off cylinder pressure at low RPMs where detonation will happen...the computer will retard the timing for the rest. It really depends on the combustion chambers, cam, rod ratio, cooking, etc, etc, etc...I'd shoot for 11:1 for a good zone.