I been looking into doing a zvh, rung simon up at sitech racing and he said use a 2.0 blacktop block, hes got a special headgasket what blanks the extra oil galleries of, got to enalrge the water pump hole for cvh waterpump, block te breather on front and put one on the back and put a oil return in, so that sounds pretty sinple, so half tempted to go down that route,