The block though modified is a stock Kawasaki. He told me they could take the head off and bolt on a stock one and it would run.. The head is realy modified the plug holes modified and were relocated there is 2 seperate injection sets one to idele and one to GO. the Go set(4) is in the tubes between the blower and the head. Lots of machine work and lots of hoses. LOTS OF GOOO.