God I hope its nothing internal. I left the metal shrouds back on for sure. I just thought that those were to help protect them from the heat off the manifolds. Well I suppose its going to go to the mechanic. Just curious but what did it cost you to have the cracked piston issue fixed? I am gonna be pissed if I have to have the motor pulled out. If that is the case I will be calling my buddy's dads junk yard in search of a GTP motor.