I have a 73 Arctic Cat 440. The engine has a new clutch side oil seal installed and runs great. I had the engine out degreased the engine and sled itself. Runs great. Hood has some stress cracks, but nothing major. Track is good. The heads are the dual plug heads are called sport heads. This means there are 2 plugs per cylinder. Pics available. $600.00 O.B.O.