Hello,

What would you say would be the max compression ratio that could be run on pump gas on a 416 small block with

open chamber heads
NO quench
hyd roller cam 254/260 @.050
.640/.640 valve lift
104/112 CL

would 9:1 be the ticket?

or better go 9,5:1?

Id rather go with the CR ratio that will let me set up the proper advance without pinging for max power on pump gas rather than being able to run on pump gas with no pinging by backing up on timing and not being able to run the engine to its full potential.

I hear that 1 full compression point equates to about 4% increase in HP aprox. So I guess going from 9 to 9,5:1 on the above combo wouldnt translate to about 10 extra HP----thats if it doesnt ping on pump gas at 9,5 of course.

I want it to run setup to make the most power on pump gas all the time....sooo.....

what compression would u run?