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Re: Compression Test Results?
Just a couple of observations based on the information you provided. First, the compression numbers aren't out of line with the possible exception of cylinder #3. The oil consumption also isn't atypical depending on how hard it was run. Oil consumption on a BBC isn't necessarily ring related. The valve guides in the heads often contribute to this. You don't indicate what the guide material is, the stem clearance , what oil seals are being used, etc. Soot all over the transom could be the result of an over rich induction system. You've gotten some good advice here. I'd squirt a little oil in #3 and see what it does. Then I'd do a simple leakdown test. If the numbers are low or are inconsistent, I'd leak it again after removing the valve covers and exhaust manifolds. Doing the leakdown test with a mechanics stethoscope will tell you what's happening.You can listen in the exhaust ports, drop the scope down below the cam to the crankcase to hear what's going past the rings and down the carb into the intake plenum to listen to the intakes. One step at a time, first things first. Your dilema is that you don't know exactly what was done to the motor and how it was done before you bought it. If nothing more, you'll have a good Baseline for the future.I hope this helps.
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