Re: 200 Mariner head
Ouch!! The motor sounds like it may have been apart before . . . . Those compression numbers are NOT good for that motor. Healthy 2.4L and 2.5L 200 mercs/mariners will have roughly 125psi in each hole. Below 100psi is tear down time. Those head gaskets sound terrible . . . I have never seen gaskets blown as badly as you describe. Water (especially saltwater) entering the combustion chamber on any engine is VERY VERY bad . . . If the cylinder walls aren't scored . . . try replacing the head gasket and do another compression test (maybe even another gage). Make sure you use a good torque wrench and follow the instructions in the manual for torquing the head bolts . . . There is a pattern and procedure that should be followed. If you are back close to 120 - 125psi with the new head gaskets . . . then run it and get fuel through the motor.
Are any of the cylinder walls steel? or are they all still original chrome?
If you have any pics post them . . . locater pins can work themselves out and cause damage you describe, but they will score the cylinder walls.
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