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cobragene 03-27-2022 05:26 PM

FE engine builders
I have a 428 bored .030 with performer heads 6006 from late 1990s, when the engine was completed comp ratio came in at 9.9-1 later I had an issue and the heads cut .004 . The head Literature says chambers are 72CC and each .005 cut reduces chamber volume by 1CC. Can anyone (Brent) tell me what comp. Would now be? Thank you

Unique427 03-27-2022 06:21 PM

Mahle provides a compression calculator.
You will need several specifics from your
engine build documentation to complete.

blykins 03-28-2022 10:44 AM

If it was exactly 9.9:1 before and you don't had heads cut .004" then you approximately knocked off a cc, which would raise your compression ratio about .1 of a point. So you're still at around 10:1.

cobragene 03-28-2022 06:47 PM

Thanks guys

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