Quote:
Originally Posted by Apogee
Neil, FWIW, KORE3 C5/C6 based big-brake kits actually narrow the front track width by .240" per side relative to the factory disc setup and widens it by .200" per side relative to the drum setup. Why the factory had such a track width discrepancy between the two versions, I can't say. Our kits are based around the Chevy drum hubs, so the track width is essentially caused by the difference in hat thickness between the C5/C6 rotor (.300") and the factory drum (~.105"). This will be true for any kit (e.g. Touring Classics) that is based around the factory drum hubs...with the only possible variable being the hat thickness of the rotor used for the kit. Kits that manufacture their hubs to some flange offset other than the factory drum hub spec can fall anywhere since they control the mounting caliper position as well.
Our kits can be installed on either of the drum spindle variants, 1/2-20 or 5/8-18 upper mounting bosses, or the disc spindles. We supply different hardware with each GM short-spindle kit so that it will match the spindle, however the brackets are the same regardless of the particular short-spindle. If you have sets of both drum and disc spindles available, we usually suggest using the drum spindles just because you can sell the disc spindles to guys who want factory discs for a much better return than you can the drum spindles.
The only aftermarket "big-brake" kit that I know of that is designed to work with a 1-1/8" bore master cylinder mounted to a vacuum booster would be the PBR SUV/truck caliper based kits offered by CPP. They manufacture their own rotors, so you're locked into using whatever they have to offer in that regard and the caliper are almost twice as heavy as a C5/C6 assembly, but they definitely fill a gap between factory type brakes and higher performance oriented big-brake kits.
Hope that helps answer your questions,
Tobin
KORE3
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Seems like most of the C5/C6 and aftermarket calipers have a bore area of around 4". This compares to the stock disk bore area of around 6.5". The C6 Z06 caliper bore area is larger at around 7.6". Anyone tried a C6 Z06 setup with the factory 1 1/8" master? I don't want to upgrade the master because the car is an original '69 Z28 and I want to keep it stock-appearing under the hood.