well I took the head off today and just 1 cylinder was messed up. the piston and the head in the #4 cylinder was demolished. All four valve heads were missing WITH all four valve STEMS still secured to the retainers No other valves or pistons were damaged. but there was peices of metal in all 4 cylinders. I guess from turning the engine over, after it blew up, spit peices into the intake and back into the other cylinders. I've never heard or seen anything like this. the whole engine was clearenced and clayed before assembly. and i was running b16a pistons(for valve clearence issues). the stage 3's were in for 3 weeks. bad luck, shoulda bought them ferra valves...