Thread: Heads???

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Originally Posted by colesscamaro

If you are looking at buying heads, I would recomend looking at open chambers, the old rule, you can run closed chamber or open chamber pistons, with open chamber heads, but you cant run an open chamber piston with a closed chamber head, really rings true. And if your on a budget, like most oif us are, the available "off the shelf pistons" for closed chambers is very limited if you are going to run pump gas. The closed chamber heads are great if you are looking at building a motor with a compression ratio of 12.0/1 and up, But there are very few closed chamber options for piston/ head combinations that will keep your compression in the range of 10.0/10.5/1 where you need to stay to be able to run pump gas. It's just something to consider when you start shopping for heads.

that may not ring true you better check your close chamber piston with a open chamber pistons. the old close chamber O port heads will hit on the sides of the close chamber RECT port head pistons the hi cr pistons on the EX side