What do these compression results mean? 351w mercruiser

rabristol said:

I have a 1983 mercruiser 351w that overheats at wide open throttle. Every possible system related to the cooling water has been gone through. Next thing was a compression test, however, Im not sure on the results?

Here are the compression test results: Is there a head gasket issue between #4 and #6 cylinders??????

Wet test w/oil Results Dry test results
1 130 2 128 1 121 2 122
3 140 4 117 3 138 4 110
5 130 6 100 5 120 6 95
7 145 8 140 7 130 8 130

Click to expand...

rabristol said:

The boat is a 1974, however, I have a 1983 long block. Your right about the numbering, it is a ford so the numbers are off.

Click to expand...