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Wanting to Raise the Compression

732 Views 4 Replies 3 Participants Last post by  demonstang76
Alright guys i want to make myself 100% clear on this before i start buying stuff i cant use and this site hasnt let me down yet

I have a 65 289 block and bottom end, with hyper. flat top speed pro pistons with 4 valve reliefs (+8cc). i have ported 302 D0OE heads with 2.02 and 1.6 valves (i was told 60cc combustion chambers). Im installing a X303 cam(.542 lift). By the looks of the heads with the 2.02 intake valve i highly doubt it could be milled down anymore. if it was the head, if sat flat, would sit on the valves lol. so im wanting to get the compression ratio up too at least 10:1 in order to do that with the gasket and pistons i have i need to drop at least 4cc's of combustion chamber to get too 10:1.

Now with all that said anyone have any experiance with pistons i could change too that will give the 2.02 valves enough room to open but raise my compression a little? Just so everyone knows the engine is currently in a car with heads so i cant get the dimensions of the valve reliefs or piston clearance myself. any ideas at all will be appreciated Thanks in advance
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damian, i hate to burst your bubble but looks like no body else is going to step up. this is a bad idea. IF your chambers are 60cc you are already at or about 9.5-9.6, with a iron head and HYPERPATHETIC pistons....this is not good. the hyper pisons are very brittle and pron to breaking under detonation. why are you wanting more compression anyway?
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