Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Need help diagnosing really weak rebuilt 350
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Old 01-27-2013, 01:40 PM
gfackrell gfackrell is offline
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Originally Posted by lmsport View Post
A rebuilt head should have zero leakage past the valves.
Piston ring leakage of 1-10% would be acceptable for a stock rebuild.
Did you check the cranking and running compression?
That's what I figured. Based on that I would say that the valves were very poorly rebuilt, and that the rings could be fine. Is that a decent assumption?

Yes I did a compression test prior to the leakdown. I was getting 115 psi on my best cylinders, and 89 on my worst. that's what clued me into a problem in the first place.
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