Originally Posted by Caballerokid
I appreciate the input. The last question I've all of a sudden thought of... will I have issues with running a heart shaped 64cc chamber with these pistons
? I'm .025" in the hole so that helps some...
I get 10.7:1 which can work on the street with alum heads. With a .041 head gasket.
That would be a lot to ask for from cast iron heads. Now with a giant cam and good tune with good weather conditions maybe 93 will work but hot engine on a hot day may knock. Best to stay in the 10:1 range for most cast iron applications. Larger cam can help but with smaller cam regular flat tops would be a better bet also cheaper. Depends on the end goal. All out racing more is better as long as you got the fuel to support it.
Can you get e85 in your area? Not in mine but works good for high compression engines when carbs are tuned for it.