I tend to agree, I know with carby jets you dont drill them out to go up to the next size, the burrs and "swirl" the drill imparts effects fuel flow enough to be a problem, I guess with gas it is less of a problem but it could still cause an uneven flow. > > the problem with drilling orifice holes is that there is no guarantee > > that the hole does not have burrs and is at 90 degrees. > >