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That helps seat valves when you are driving, that might explain how the drives well despite a poor leakdown result.
But a compression test is only 150 psi, and a leak down should be about 100 psi, so the disparity in the results is unlikely. You are being told the cylinder seals well enough to create 150 psi, yet the leakage is huge.
The only explanation I can see is that his air supply was limited on the leakdown.
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
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