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Generation III Internal Engine
compression ratio guesstimate

Generation III Internal Engine 1997-2006 LS1 | LS6

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compression ratio guesstimate

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Jun 3, 2009 | 06:07 PM

#1

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compression ratio guesstimate

my buddy has a 383 ls6 motor with 62cc Dart heads that were milled a little. The engine builder said the comp. ratio was at 11.2-1. Now somewhat guessing if we put on 317 heads with 72cc chambers what do you think it will drop the compression down to with GM MLS gaskets? Were looking to make it a boosted motor and drop the compression down a lot. I know its pretty vague kinda but id assume they are flat top pistions to get the compression up there. What you guys think?

Last edited by Taubr Unit; Jun 3, 2009 at 06:15 PM.

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Jun 3, 2009 | 06:22 PM

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if you use gaskets that are the same thickness you will drop around 1.2 points or so in compression.

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Jun 5, 2009 | 10:55 AM

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Download the appropriate spreadsheet and plug in engine specs/head volume/head gasket height etc to get compression:

https://ls1tech.com/forums/generatio...sier-than.html

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bring, compression, engine, gasket, mls

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