Wow, that Merc engine still skips by. My compression it 175 lbs. I completed that motor in 1974.
Denny - what does that mean?
I'm not real good at reading between the smilie faces.

I only meant to offer another method of testing a motors potential.
Granted its dependent on other systems, like valve and ring seal, but certainly a function of dynamic compression ratio on a properly built engine.

But then - I'm still on a steep learning curve.
Tell me what I'm missing here . . .