I have a 509 ford built for marine use Ross pistons eagle h-beams and svo alum heads. On the third trip out 3.5 hours on new engine it gave up a nice chunk of the #2 piston and ring. I pulled the head and found the gasket had pushed up approx 3/8" and appears to have let water into the clyinder causing the piston failure. Gaskets are fel-pro 1028 9/16 arp studs torqued to 140. The gaskets have vht copper coat and maybe gasgachinch? on them. Let the mach shop put this one together. No sign of heat bottom of piston looks new. Ran great did not go lean that I can tell. What could cause this???