The guy that did our Briggs motors had a son that won several National Championships. He ran twin 2 strokers at Daytona in a Laydown Kart, reportedly doing 190 MPH. The man always talked about how little he had to do to them. That was until I ask him about building one for me. When he realized what he would loose by not building me 6 or 8 motors or more a year, he changed his tune.