Also, I don't think the main bearing size is an issue for normal Zillas. The bigger concerns are the porting is not adequate, the wrist pin is to low in the piston and too small, the rod and it's bearings are too small and too short, the crank pin is too small and too long, the cylinder head design is wrong, the exhaust valve design is obsolete, and the trans gears have lousy hardening. Why the hell do we like this thing so much?