by cjbiagi » Mon May 26, 2014 1:33 pm
I have redrilled rotors on my car. The issue at hand is there is very little room on the rotor hat for a traditional GM 5 x 4 3/4" bolt pattern. It can be done but it puts the stud into the side of the rotor hat. I had mine drilled to a 5 x 4 1/2" pattern which is better and happened to match my wheels. So, it depends upon whether you already have wheels for the car or not. If not, then I would suggest going with the smaller pattern and getting wheels to fit that pattern (which happens to be a very common Ford size). You do have to use screw in studs as there is not enough room for a press in stud. One of the studs will slightly intersect one of the vanes on the rear, this is normal and to be expected. So when adjusting the pattern on the rotor you need to account for that when your machinist is indexing where to start. One of the new studs will also somewhat overlap a old stud. You can buy inexpensive bolt pattern gauges which can also be used to help index everything.
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Clyde.........75 Monza 2+2