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05-31-2018, 11:47 AM
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#1 |
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Registered User
Join Date: Apr 2014
Location: Baldwin County, Alabama
Posts: 163
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stock compression ratio on a 1985 C20 350?
Anyone know what the compression ratio is on bone stock 350 from a 1985 C20? Flat top or dished pistons?
Thanks
__________________
 '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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06-01-2018, 05:31 PM
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#2 |
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Registered User
Join Date: Mar 2013
Location: Campbellsville, KY
Posts: 888
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Re: stock compression ratio on a 1985 C20 350?
Looks like 8.2 or 8.3.
__________________
Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue. |
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06-01-2018, 05:33 PM
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#3 |
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Registered User
Join Date: Apr 2014
Location: Baldwin County, Alabama
Posts: 163
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Re: stock compression ratio on a 1985 C20 350?
I have the LT9. So it looks like it's 8.3:1
Thank you very much for that.
__________________
'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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06-03-2018, 07:33 AM
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#4 |
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Account Suspended
Join Date: Jun 2015
Location: No longer here
Posts: 1,000
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Re: stock compression ratio on a 1985 C20 350?
Can you shed some light on why you needed this information ? Just curious.
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06-03-2018, 06:22 PM
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#5 |
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Registered User
Join Date: Apr 2014
Location: Baldwin County, Alabama
Posts: 163
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Re: stock compression ratio on a 1985 C20 350?
I'm looking to add a "RV" cam, mild cam and heads. I'd like to keep my comp ratio to about 9.1 to 9.5. Looking at World Products 170cc runner, 67cc heads with 0.039 squish Felpro gaskets.
__________________
'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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