This should be any engine. Advancing cam 4 degrees with a 3 keyway sprocket. 1. Do you have to readjust valves? 2. How do you check valve clearance with engine together ? My thoughts are just rotate cam until 4 degree adv. mark is pointing straight down. Unhook chain and rotate crank until the same mark lines up with it. Then put chain back on. I should feel or hear valve hitting piston when I rotate by hand. Your thoughts?