Quote Originally Posted by speED
Skip Fix,
Your TA has a step bore master?
GM started putting the low-drag calipers on the '81 firebirds (and camaros?). I know the old '81 T/A I had had the aluminum master with stepped-bore M/C and low drag calipers. They also used a different booster to fit the larger OD of the stepped-bore M/C. I suspect that's exactly what Skip has on his '81...