shovelhead is a type of harley-davidson motor(66'-84')......alot of oil leaks, and vibration.........LOCTITE makes a bolt -n-nut glue that is RED.,,,,,,,,I have a couple shovelheads.....that dont leak oil, because of the loctite........so thats why I chose .SHOVELHEADRED............... ...........I have been called worse things....................... but my ole' lady calls me Bud, when she isnt mad at me