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05-31-2018, 11:48 AM | #1 |
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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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'84 Suburban C10 Silverado - laying pinchweld to the ground on 22/24. /Porterbuilt / Accuair / Bonspeed / Landsail / Auburn Gear / Richmond Gear / Moser / Raybestos / ProMaxx / Edlebrock / Street Demon / Taylor Wire / K&N / MSD / KillMat / SOLD: 1985 GMC Sierra Classic 2500 3+3 Crew Cab Long Bed |
05-31-2018, 02:36 PM | #2 |
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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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05-31-2018, 10:10 PM | #3 |
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Re: compression ratio on a stock 1985 C20 350
Thank you for the response.
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'84 Suburban C10 Silverado - laying pinchweld to the ground on 22/24. /Porterbuilt / Accuair / Bonspeed / Landsail / Auburn Gear / Richmond Gear / Moser / Raybestos / ProMaxx / Edlebrock / Street Demon / Taylor Wire / K&N / MSD / KillMat / SOLD: 1985 GMC Sierra Classic 2500 3+3 Crew Cab Long Bed |
06-01-2018, 11:12 AM | #4 |
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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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06-01-2018, 03:25 PM | #5 |
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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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'84 Suburban C10 Silverado - laying pinchweld to the ground on 22/24. /Porterbuilt / Accuair / Bonspeed / Landsail / Auburn Gear / Richmond Gear / Moser / Raybestos / ProMaxx / Edlebrock / Street Demon / Taylor Wire / K&N / MSD / KillMat / SOLD: 1985 GMC Sierra Classic 2500 3+3 Crew Cab Long Bed |
06-01-2018, 05:06 PM | #6 | |
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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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'84 Suburban C10 Silverado - laying pinchweld to the ground on 22/24. /Porterbuilt / Accuair / Bonspeed / Landsail / Auburn Gear / Richmond Gear / Moser / Raybestos / ProMaxx / Edlebrock / Street Demon / Taylor Wire / K&N / MSD / KillMat / SOLD: 1985 GMC Sierra Classic 2500 3+3 Crew Cab Long Bed |
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