Author Topic: GX 390 or clone 390 compression ratio  (Read 3889 times)

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Offline FlatheadPuller

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GX 390 or clone 390 compression ratio
« on: September 09, 2012, 07:17:42 pm »
What I have found is the clone factory compression ratio is around 8.1-1. Anybody know what they are after a flattop is installed?
Dennis Bazzett
Grandville Michigan

Offline Ron Atchison/A.C.E. Race Engines

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Re: GX 390 or clone 390 compression ratio
« Reply #1 on: September 10, 2012, 06:16:17 pm »
What I have found is the clone factory compression ratio is around 8.1-1. Anybody know what they are after a flattop is installed?
i think the dish is 7cc so, if that's correct it would be around 9.2:1 
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