RE: Jett .56LX vs West 52V1 for Magnum R
I've restored a couple old engines by honing out the iron liners and making new pistons from steel. The final fitting is really tedious because the piston/rod is used like a lapping tool in the tapered liner. It is a good idea to make a special rod just for lapping the piston to the liner out of steel.
It really is amazing how the factories are able to quickly spit out engines with perfect fits as tight as they are.