Thanks a lot guys you jinxed me. I'm putting my 572 together today and throw the timing cover on and want to install my ATI damper on to check my timing marks before I install the heads this weekend. Well my machinist must have removed my key to do his work and it didn't get reinstalled. Usually not an issue but this is a Calias crank with a 1/4 inch keyway instead of a 3/16 so it uses a 1/4-3/16 stepped key. I have over 20 keys here but of coarse no stepped keys so I found one on Summits site for 18.00 and it should be here Monday or Tuesday. Oh well I guess I will be building the transmission for it instead. LOL