Quote:
Originally Posted by Franked
Thanks for all the response, I feel it can handle 10-1, this guy builds some badass stuff though, so I don't really want to argue with him.
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Not going to get many answers when the question is lost 19 pages deep in a thread.
Your compression should be matched up with the rest of your parts. The compression increase from aluminum heads varies, and not every case is the same. Small cam, manifolds and stock OTB parts (like a 260 cfm d ports KRE) with highway gears, you may only want 9.2 compression. Big cam, headers, 325 cfm ported KRE d port, single plane, deep gears…you may want 11:1.
My Pontiac 461 is well over 11:1 compression on 91 octane. It is a street engine, runs full timing, and has ported iron heads.