found out I need new pistons rings on my 550. The 4th piston is gone their is not much their as far as rings go. Anyone know where I can get some? want to get the motor back together so its not in pieces in my garage. Found a place to get my clutch from since my clutch is gone but can't find piston rings anywhere. also any tricks to putting the heads back on? Thanks guys this site has been a big help.