The exhaust valves. Ended up taking out the whole engine. Needed to bore the block. Head was salvageable on that one. This spring the timing belt jumped and took out cylinder 3, passage head, and had to bore the block again. I am a firm believer of change the timing belt after every time it's removed now. Figured my new timing belt from the last time should still be good. That was not the root cause of the timing jump. But I'm sure it didn't help. The tentioner was at its loosest adjustment on the block.
