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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#28815 10/17/2004 11:30 PM | Joined: Sep 2003 Posts: 2,384 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 2,384 | I ran a compression check on the new purchase, has 80-85 psi all cylinders. I know to look for uniformity, but this number seems low to the old hot rod V8 head of mine. Is this typical of a Stovebolt? Not sure if its old age creepin or gas at $2 a gallon but this is now my second six in a row I'm planning on keeping! Brian | | |
#28816 10/18/2004 12:15 AM | Joined: Feb 2001 Posts: 1,096 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 1,096 | I had a fiddle with my truck , just to help compare ,, mine is close to 120 average . | | |
#28817 10/18/2004 12:57 AM | Joined: Feb 2004 Posts: 29,742 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,742 | My Motor Magazine auto repair manual lists Chevrolet compression ratios from 1940 to 1953 from 6.5:1 up to 7.5:1, and compression pressures from 110 to 112. Now, that can't be correct, but I wouldn't get too concerned about consistent pressures of 85 pounds. The next gauge you try might average 100 pounds or more. Uniformity is much more important than the gauge numbers.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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#28818 10/20/2004 4:29 AM | Joined: Jun 2003 Posts: 41 Junior Member | | Junior Member Joined: Jun 2003 Posts: 41 | Might be the gauge, try another one, my 235 shows 125 to 130 across the board and this is a far cry from a new engine. I'm getting some blowby and get about 300 miles to a quart of 20W50. | | |
#28819 10/20/2004 5:42 AM | Joined: Sep 2003 Posts: 2,384 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 2,384 | Too late, I've almost got it out. It has been sitting & has a bad freeze plug(I hope, water pours from the flywheel) & clutch is gone. It purrs like a kitten so I am gambling & its gonna be OK w/some work. There is a front freeze plug leaking from rusting out so I hope the same for the rear & not a crack 3" long. I thought maybe poor valve sealing from not running could account for low #s. Brian | | |
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