Just registered here in hopes of getting and sharing info on my KJ. Mine has more than 150,000 miles and came home from loan to my grand daughter with a blown head gasket. She had a friend 'fix' it,but as it still was running rough I started a diagnostic and decided it needed a tear down, what an adventure. He hadn't resurfaced the head and it was leaking compression,out of time, and had bent a valve and dinged a piston. Build up process is at timing stage ,definitely want to get that right this time!