Compression Test Results

[Steve S]

I don't read much into compression tests. There is a wide spec range for a reason.

I looked up Mercruisers specs back when I had my 2000 340DA. On the 7.4's I had in the 340, the spec was 30% difference between the highest and lowest cylinder. So if you have a 160 cylinder as the high, the low could be 112.... Eek... and I was worried at 135... LOL (She did hit WOT.)