Thread: Too much crankcase pressure, novice engine builder

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Originally Posted by NegativeZero

I've done a lot of reading on this and can't seem to find an exact answer, but cylinders within 15% of each other seemed to be the general consensus for acceptable.

A leak down kit has been ordered and I'm sure will give some results to consider.

15% is a pretty wide spread. I would question anything more than 10%, especially on a new motor. Did you follow with a wet test?
Probably irrelevant, the leak down test will tell more.