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05-31-2018, 11:48 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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compression ratio on a stock 1985 C20 350
Anybody know the compression ratio of a stock 350 from a 1985 C20?
Thank you.
__________________
 '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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05-31-2018, 02:36 PM
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#2 |
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State of Confusion!
  
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,083
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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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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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05-31-2018, 10:10 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: compression ratio on a stock 1985 C20 350
Thank you for the response.
__________________
'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, 11:12 AM
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#4 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,213
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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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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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06-01-2018, 03:25 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: 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.
__________________
'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, 05:06 PM
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#6 | |
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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.
__________________
'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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