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I had the engine rebuilt about a year ago but have been having some problems with rough running. The engine has 100M larger size pistons. So I did a compression check. No too long after the engine was broken-in the compression was 1 - 4, 183, 185, 184, 183. A year later with 5,000 miles or so on the engine the compression was 1-4, 165, 170, 180, and 170. Then I put some oil in each cylinder to test it again then it was, 1-4, 172, 176, 186, and 176. What does this tell you?? From what I have read it seems like the numbers are too far apart? Thanks Marty