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MY Mercruiser 502 8.2L V8 between 133-155 pounds pressure dry, not warmed up & throttle at idle instead of wide open throttle. I was comparing the difference between the cylinders seeing if anything was obvious bad...

Warmed up... Open throttle valve will give you a higher reading.

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12y ago
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Q: What is the cylinder compression of a mercruiser 7.4 mpi engine?
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