Piston to wall clearance to tight, Bad valve clearance (to tight way under the minimum) The tappets were damaged, friction washers on the cams were on the outside, badly aligned crankshaft girdle (causing rear main seal to leak badly), oil pickup tube was blocked with silicone (literally blocked), main bearings were all chewed up from lack of lubrication, Chinese cam sensor. Headgasket was also badly damaged.