Craig,
I knew I had this info but just had to find it. Right from Wilwood engineering,
GN caliper 2 per mc, piston 1.75-1.38-1.38 6 pistons = 7/8-1" mc
SL caliper 2 per mc, piston 1.75 4 pistons = 7/8-3/4" mc
SL caliper 2 per mc, piston 1.38 4 pistons = 7/8-3/4" mc
SL caliper 2 per mc, piston 1.12 4 pistons = 7/8-3/4" mc
Hope this helps,
Cranky
