I've done the oil mod alot to 450's I've rebuilt. It cost like 5 dollars. I use a 55 drill bit and a 20 cent o ring. But you gotta buy a new topend gasket kit and pull the cylinder.
I wouldnt finance a 450 anyway. By the time its paid off youll pay wayyyy over the asking price.
I wouldnt finance a 450 anyway. By the time its paid off youll pay wayyyy over the asking price.