Why? That's a good question that I can't answer, but I can say that you're not the first person to be told by a parts guy that you need a 1-1/8" bore MC because you're running disc/disc on a car without taking the caliper piston area into consideration. Just because GM ran 1-1/8" MC's for years with it's power brake applications does not make it universally true, only true for the caliper combinations that they chose to run for years.
It's ironic because CPP makes and sells it's own master cylinders from it's own castings...they have 15/16 and 1 inch bore options last I checked. Reduce your bore size and you should see a huge improvement in your braking performance.
Tobin
KORE3
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