Exhaust cam. I started loosening the valve adjusters, but then noticed without the timing chain, the cams just lift out, duh... A couple valve springs went all over the floor when I flipped the engine back upside down. Now would have been a good time to take the springs off by hand... Weird, I didn't see any retainers go flying. I haven't disassembled the head yet. Will do pics of that in another post...