how big of a cam can the stock pistons handle without ptv clearance trouble? I know that the 5.9 Mag has got some little dish in the piston, but no real valve reliefs.
Piston are usually ".050 -060 " ,in the hole. Valve train is limited to ".510 - .520 depending on valve train decision. To be honest, I don't see a need beyond "480-490 lift " unless the heads flow more than 260 ...270 ,on the intake side....
