jefflock 69 Dart 408 10.08 best pass so far FABO Gold Member Joined May 18, 2006 Messages 3,515 Reaction score 111 Location Kansas Sep 10, 2007 #1 What are the differences between J heads and U heads? Thanks Jeff
3 340mopar Sorgermotorsports Joined Jan 25, 2006 Messages 3,604 Reaction score 12 Location Soap Lake, WA Sep 10, 2007 #2 If they are "915" castings, nothing. Chuck
