I took some pictures of the inside of the 6.5 in my latest parts truck.The truck is a 93 k3500 ex-cab lb. 220,000 miles. The engine is a 506 block w/ 5/8" oil cooler lines [1/2 npt threads in block]. Not the original engine obviously. The head gasket on the passenger side has a very big piece missing. The rocker arm plastic guide buttons were melted. #7 piston is melted down to the top compression ring. #3 and #6 pistons have dents in the tops of the pistons from what looks like glow plugs that had broken off. No marks on the heads or vissable cracks. I haven't taken the turbo apart yet to see the aluminum coating it should have. How hot do you suppose this one got?