when i order my heads, i am debating on 64cc or 70cc heads, 64cc will give me 10:1 and 70cc will give me about 9.5:1, this is a daily driver, but i am shooting for about 420 hp. my question is how reliable is 10:1 for daily driving? the cam i will be running with the heads is 234* duration intake and exhuast and .488" lift intake and exhaust. thanks for the help
greg
greg