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#1 |
Registered User
Join Date: Apr 2014
Location: Baldwin County, Alabama
Posts: 163
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compression ratio on a stock 1985 C20 350
Anybody know the compression ratio of a stock 350 from a 1985 C20?
Thank you.
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#2 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,894
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Re: compression ratio on a stock 1985 C20 350
Depends on what version you have. Anywhere from 8.0 - 9.5 to 1 compression ration.
Compression check numbers are normally about 180-190
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#3 |
Registered User
Join Date: Apr 2014
Location: Baldwin County, Alabama
Posts: 163
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Re: compression ratio on a stock 1985 C20 350
Thank you for the response.
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#4 |
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Join Date: May 2009
Location: Motor City
Posts: 9,194
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Re: compression ratio on a stock 1985 C20 350
The LT9 was the base 350 engine for Federal Emissions. Compression Ratio was 8.3:1
There was also an LS9 available for California only. Compression Ratio was 8.2:1 https://www.gmheritagecenter.com/doc...olet-Truck.pdf K
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#5 |
Registered User
Join Date: Apr 2014
Location: Baldwin County, Alabama
Posts: 163
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Re: compression ratio on a stock 1985 C20 350
Thanks for the info. I was looking into buying some heads and trying to decide between the 67cc or 76cc combustion chamber. World Products SR 170cc intake runner.
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#6 | |
Registered User
Join Date: Apr 2014
Location: Baldwin County, Alabama
Posts: 163
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Re: compression ratio on a stock 1985 C20 350
Quote:
Thanks for that. I found the spec on the link you left. I have the LT9, 350 (M). Showed me my bore, stroke, compression ratio, all kinds of good stuff. I appreciate it.
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