There are a few options
What I would do is figure your compression with an online compression calculator using a flat top piston and your planned bore size. Don't forget to include the number of cc's for the valve reliefs as it varies somewhat between piston brand and type. Use a zero deck in the calculator so you know your base point. Then if your compression is still too high then figure what size dish you will need to achieve your compression goal. Then tell your machinist to deck the block to zero deck.
https://butlerperformance.com/i-3164...%3Fq%3Dpistons
https://butlerperformance.com/i-3015...%3Fq%3Dpistons
https://butlerperformance.com/i-2445...%3Fq%3Dpistons
https://www.summitracing.com/search/...ac?keyword=400 piston&ar=1&kr=pontiac 400 piston
https://www.summitracing.com/parts/d...b/make/pontiac
https://www.summitracing.com/parts/d...b/make/pontiac
Among others
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Tim Corcoran
Last edited by Tim Corcoran; 05-01-2024 at 03:32 PM.
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