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Hi all, I have 86 with 454 chevy eng. It smokes on driver side exhaust ( duals) after it warms up. It's very bad at stop lights ( at idle ). Has good compression on all except number 7, driver side rear. I'm hopping it's the upper end. A bad valve would explain 25 lb. compression, but maybe not the smoking. The spark has a lot of oil on it. If you have any ideas, please post. Thanks Tom
Do a compression test and record the readings. If you have one or more cylinders much lower than the rest, squirt some oil in the spark plug hole of the low cylinder(s)and do another test on the low one(s). If the compression coms up you need rings. If it stays the same it's valves or a piston.
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