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Re: Compression Test Help Needed[200/84] posted by Peter Cohen on
Thursday, 30 November 2000, at 1:00 a.m.
Another important item in a compression test is a fully charged battery. Slow cranking will give lower readings.
I often read that you are looking for no more than 10% difference between highest and lowest, but it seems like most older engines are outside that spec aand often not in need of rebuilding.