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agree on compression numbers
generally if the timing appears to have moved that much, usually the outer ring of the damper is no longer bonded. use a cylinder stop and degree wheel to indicate TDC. if the damper ring has shifted, get a new damper.
You use the motor serial number to buy motor parts. You use the drive serial number to buy drive parts. Again, the boat doesn't matter when buying motor or drive parts
135hp is a 3.0 liter 4-cylinder
175-225hp is a 4.3 liter 6-cylinder
First, welcome aboard
Second, the boat doesn't matter, only the motor/drive matter when looking for motor/drive parts
So what motor and drive do you have in your pontoon?
Your dealer is an idiot, or a scammer
Your motor has non-adjustable valvetrain and roller lifters. If you have a ticking, put a straight edge across the top of the rocker studs to see if one is pulling out.