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Originally Posted by F-BIRD'88
I not sure but I think the 4% general rule for compression ratio/power difference refers to peak hp. Torque at the low end can be effected more.
Take it as a general rule of thumb.
Even at that if you were limited to running economical 87 octane gas (and the limited cr, you'd still have a pretty good motor. Mostly because the cam is fairly mild as cams go and the heads are pretty good. Should work well.
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FLAT TOP and 75CC AFR is the best torque combo... in a 355 makes for a nice easy 9.5:1 which is still 87 frendly if you chose a 260-274 duration cam and keep the cranking compression numbers around 175-180
a 12CC dish and 75CC is less than what you want.. its at best 8.75:1 with conventional gaskets to get 9.1 you will need a shim style headgasket...