Quote Originally Posted by pushrod4life View Post
the max you can get out of iron heads in most applications is around 11:1 .I've shatter 5 hyper pistons b4 from a bad linkage to the secondary butterflys on the carb b4
I've got a 13:1 iron-headed 460 in a 83 cougar that runs just fine. Plenty of people run more than 11:1 with iron heads. It's called race gas. And please explain how a bad secondary linkage caused your pistons to shatter.