we are taking about the barrell and head , not the rest of the bike, flywheel, carb etc. matcg the ports or drill some boost ports from the inlet side, i seen one drilled and filled within an inch of there life. prolly does fork all but at least it gets ya bike on the track even if you run it as a stock TS barrell. you would have to check the post of if someone from Adel is heading to bonaza