Why do some calipers have the “Corvette” logo machined off?
Only GM can market and sell calipers with the “Corvette” lettering on them due to trademark laws. Both PBR (the OE manufacturer for the Corvette C5/C6 calipers) and the remanufacturing companies must remove the logo since it is not technically an original GM part if it is not sold through GM. This can be useful if your wheels are particularly close fitment. Calipers without the logo have about .060″ to .080″ [1.5mm to 2mm] more clearance between the caliper face and spokes of the wheel relative to GM calipers with the logos.