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Mod | | | Forums66 Topics128,021 Posts1,055,355 Members48,420 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Jan 2010 Posts: 38 New Guy | | New Guy Joined: Jan 2010 Posts: 38 | Hey Guys, I did a compression check on my engine last night just for the heck of it and noticed I was getting 80 PSI on all 6 cylinders. I searched the forum and found it should be around 120. Should I rebuild or just keep running it? It runs fine and feels like it has plenty of power. Just hate to spend alot of money on something that works. Just fishing for advise.
If it's broke hit it harder!
| | | | | Joined: Jan 2010 Posts: 38 New Guy | | New Guy Joined: Jan 2010 Posts: 38 | I will add the truck is in the process of being restored and hasnt really been driven any major distance in 30 years. I also have had 3 bent push rods since I took over ownership.
If it's broke hit it harder!
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | With compression that low and even across the board I question how accurate your gauge is.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | I plug my compression gauge into an air compressor line occasionally to compare its reading to the tank gauge. 80 PSI translates to about a 5.5:1 compression ratio, which is a bit low, but a lot of the time low cranking speed and/or slightly sticky valves can combine to give a somewhat lower than accurate reading.
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!
| | | | | Joined: Jan 2010 Posts: 38 New Guy | | New Guy Joined: Jan 2010 Posts: 38 | Its a chepo guage from harbor freight. I'll check it with my compressor. Thanks for the info.
If it's broke hit it harder!
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