Max lift/stock slugs

A buddy of mine was running ~.570 lift with 1.7 rockers in his 5.9 Magnum. Stock short block with ported stock heads. We have no idea what the ptv clearance was, but upon inspection after it blew we didn't see any evidence of a valve contacting the piston.

On a side note, if you run a stiff spring (MP .600" lift springs for example) switch to one piece valves. It's well known in the Dakota world, and I have personally seen 2 engines blow because a valve snapped in half at the joining point. My buddy's engine was one of them.