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Originally Posted by silicon212
9.5:1 is pushing it. Let's put it this way - NASCAR is running 9.5:1 compression in their cars (Nextel Cup), and they run on 110 octane. Of course, their engines also run at between 8 and 9 k RPM - any detonation there would be disastrous.
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is any 9.x:1 compression good on premium? I scrapped the 383 idea, the engine I have has a good crank and rods so I making a 350 to save money, but I want to break 300hp. theres a speed pro hypo piston with 9.31:1 but i'd rather stay with KB, the pistons im looking at are
http://kb-silvolite.com/performance....tails&P_id=290 I estimatied 9.5 :1 with my 70cc heads cause its inbetween 64 and 76 heads
the premium gas up here is 93 octane.