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okay so i talked to the guy at summit and he said that it is impossible to get 10:1 compression in my 289 whith 58cc heads unless i have them custom made!?!?! I have to believe there is a piston out there that can do this but maybe i am wrong. Anyway i was wondering if any of you guys reached this compression with 58cc combustion chambers or do i just need to settle with the 9.3:1 the sealed power flattops give me? Thanks for any help!
 

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For a 289, Your best piston choice is a flat top piston with the "eye brow" valve clearance cuts.
 
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