Doc, I have never had one of these 413 tow motors apart. What do the head chambers look like- similar to regular big block? I am wondering if there is a step head design piston that would make quench but keep compression low enough to run on regular. Better MPG, better torque, etc.
Another thought for pistons- 383 stroker piston made for 3.75 crank?

Last edited by mgoblue9798; 12/04/18 04:34 PM.