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38% Leak down on the exhaust valve? Sure you got that right?
leak down tests are not that easy to do correctly. They are also open to operator error and reading the gauge used. I think if you Google "leak down test" there is great article written by Hot rod or maybe Car Craft that really explains the numbers and what they mean. A good read.
I am going to assume there was air leak heard through exhaust at that cylinder?
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