<html><body><p>Started our GT6 Tuesday night to load it in the trailer for Elkhart and heard clanking. Thought we had sucked something into the intake. Turns out the exhaust seat in number 1 cylinder came loose and was pulverized. Found a 1/2" crack between the intake and exhaust. Remarkably, no damage to the valves. Lots of seat dust on top of the piston.</p><p>My head guy thinks he can pin the crack and overlap the seats to repair it. I've probably read where this has been done before but can't remember. </p><p>Has anybody done this with success? Is there a water jacket between the exhaust and intake? What are the possible causes for this crack?</p><p>Thanks,</p><p>Dave and Alex</p></body></html>