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Old 05-13-2007, 10:03 AM
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sbc oil consumption help needed

I purchased a used 1977 sbc(350) and installed it in my old chevy truck. When the truck is running a lite smoke is coming out of the tail pipes. I have no leaks on the motor but I keep adding oil and was wondering what tests can I perform to find out if its the rings or valve seals. I have a compression tester and an air compressor so I can change the seals without taking the heads off. Also if it is the valve seals what kind would be the best to use.

John

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Old 05-13-2007, 11:06 AM
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id say its the rings, im guessing if it were the valve seals the spark plugs would foul. anybody correct me if im wrong. for a temporary quick fix a can of engine restore does work, just make sure you use it everytime you change oil.
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Old 05-13-2007, 11:28 AM
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Most likely the rings, worn valve seals are most evident when the engine is started... a puff of blue smoke that goes away as the engine runs. Restore might help as a temporary fix. I doubt that it would hurt anything.
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Old 05-13-2007, 11:42 AM
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Probably the first thing to do is run a compression test.
The next thing is, does it smoke all the time or just when you start up?
If the rings are gone and the engine is in fair shape other than that. a rering kit from one of the online vendors like Northern auto parts or one of the other online vendors.
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Old 05-13-2007, 12:51 PM
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Engine smoke?

This might be worth a try if this motor sat a while before you bought it,sometimes the rings might stick allowing blowby.This product has been around a while, Marvel Mystery Oil, Wal-Mart has it.Do a fresh oil & filter change and put 1 quart of Marvel in it and drive it,also put a bottle in the fuel and cross your fingers you may get lucky I have had it work for me.Good Luck!
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Old 05-13-2007, 01:41 PM
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thanks for the tip

I just got done pulling the plugs and doing a compression check. pressure ranged fron 120 to 135 psi. The plugs look dark and have a black deposit opposite the electrode. Any thoughts? How can I check for worn valve guides or seals? Any help would be great
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