Ya, actually I have been looking closer at the other cylinders and most of them have some very light scuffing at the north and south edges of the cylinders and some have light marks at all four corners. When I first bought this boat the timing was set to all in at 50 degrees. I caught it and fixed the timing issue, but with what Dan posted earlier wonder if to much timing caused these scuffs....?

Running closed loop bad tuneup. Expensive day.

Lol one day I wanted to cry lol. Only had about five hours on motors. Start of a poker run motors where cold had no corrections from close loop yet and was a cold day. Finished a cooler of beer on the way home on the other engine.

Talked with my local machinest this morning and I am bring him both short blocks. He will be doing final disassembly and inspection. Check the cranks, upgrade rod bolts and reman rods, hone cylinders with torque plate, new rings, new rod bearings, new crank bearings, and new cam bearings. They will wash block and reassemble short block with the appropriate clearances for a supercharged marine application. Little more money than I had expected to spend on this upgrade but I think it’s money very well spent for peace of mind!!!

That sounds like a proper plan, and much much cheaper in the long run.

I believe that youd want a little more clearance on the piston to wall anyways, right?