I am up for it. But, you already know what I am up to. Was it 440 or 413 you were running to get 12mpg? That is pretty impressive for an RV.

My 413 heads are going to the machine shop tomorrow to get cleaned, magged, and shaved. Then it will be time to get after the chambers with some roloc grinding discs.

I am thinking about just doing a basic clean up of casting flash and overhangs between the port and exhaust valves. There is a BIG overhang in the runner just behind the bottom of the pressed in exhaust seat. I wonder if there would be any mileage gain from a 3 or 5 angle valve job on the intake side? Exhaust I think I want to keep the nice fat seat contact width for cooling.

It will be a while before I have any numbers with the new engine, but will get baseline gas mileage numbers with the old one this summer.

Anyone have any experience with a do it yourself ceramic coating for piston tops?