[Blacky]

The SVX uses 12x1.25 studs, the Crossfire is 12x1.5. The holes are already larger than the studs on the SVX. By drilling them bigger again I think it would have the same effect as trying to drive on wheels on which the holes are oblong from being run with loose lug nuts. The nuts will never stay tight no matter how many times you torque them.
Don't do it.