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The KORE3 325mm C5/C6 Front Big-Brake Kit for the GM short-spindle (GMSS) application adapts high-performance, high-quality, 5th/6th generation (C5/C6) Corvette brake components to your GM short-spindle equipped vehicle. This kit is ideal for those running factory spindles with or without the Guldstrand Modification, tall ball-joint kits, and other OE spindle based front suspensions designs. Please refer to the KORE3 GM Big-Brake Application Chart for details regarding specific vehicle compatibility.

C5/C6 front components are a significant improvement over the original equipment drum and disc configurations that were available on the early A/F/X-Bodies. The C5/C6 rotors measure 325mm x 32mm thick (12.80" x 1.26") and have either directional or pillar vane construction, providing higher brake torques, additional thermal mass, improved feel and better cooling for more aggressive, sustained driving without brake fade.

C5/C6 front calipers are pressure cast aluminum with full width stiffening ribs in order to maximize caliper rigidity, extend service life, and improve pedal firmness and feel, all in a compact, lightweight package. The C6 calipers are interchangeable with the C5 calipers and are approximately 25% more rigid due to additional material across the bridge of the calipers. Both C5 and C6 calipers have twin 40.5mm pistons and utilize a pad abutment design, where the braking torque is transmitted directly from the pads into the pad abutment brackets and the spindles they mounted to, leading to better performance you can feel at the pedal.

There is vast aftermarket support for C5/C6 rotors and brake pads to suit nearly anybody's needs and/or budget. This KORE3 big-brake kit provides more braking performance per dollar than any other making it ideally suited for the front of almost any early A/F/X-Body application, whether you're grocery-getting, pro-touring, or a little bit of both.

  1. KORE3 GM short-Spindle kit is designed for forged short-spindles only, of which there are three (3) basic variations as shown below. The only definitive way to identify the spindle is based on the upper mounting boss.

    GM made a fourth short-spindle design that is not compatible with this kit. The spindle is cast, not forged, and can be readily identified by the integral cast caliper mounts and steering arms. We currently do not offer a kit for this spindle application.

  2. KORE kit is compatible with many modular aftermarket drop spindles that use bolt-on steering arms similar in design to the OE spindles. Please contact us with any questions regarding such applications.

  3. Kit is 100% bolt-on. No welding, cutting, or grinding necessary when KORE3 components are used.

  4. Minimum 17" wheels are required. Not all 17" wheels will fit. Please verify fitment prior to ordering using the appropriate KORE3 fitment template. Wheel fitment is the buyer's responsibility. Please contact us if you have any questions regarding your specific application or the proper use of the templates.

1. Drum Spindle: 1/2-20 2. Drum Spindle: 5/8-18 3. Disc Spindle: 5/8-18
1. Drum Spindle:
1/2"-20 UNF
2. Drum Spindle:
5/8"-18 UNF
3. Disc Spindle:
5/8"-18 UNF

The following items are included in this kit:

  • Installation instructions

  • KORE3 GM Short-Spindle Big-Brake Bracket Kit

  • FlexKORE™ 2-piece Brake Line Kit

  • KORE3 Big-Brake Billet Hub Kit

  • C5/C6 Front Caliper Kit

  • C5/C6 Front Pad Kit

  • C5/C6 Front Rotors

Build your kit selecting from the options below. If you have any questions regarding your specific application, please don't hesitate to ask. Please specify which spindle variation you plan on using (spindles are not included with kit) so that we can include the proper components to match your application.

Price: $1,136.00
KORE3 News:

Notice: C6 Z06 calipers availability is limited. Please contact us for current stock and color options.

KORE3 is a proud dealer for Hydratech Braking Systems™, the industry leader in hydraulic brake assist conversions for the pro-touring market.

Upcoming Closures:

Independence Day (Observed): Monday July 5th

Labor Day: Monday Sept 26th

KORE3 is continuing operations during the COVID-19 coronavirus pandemic with the understanding that we will continue to do what we can, when we can, without putting ourselves, our customers, our vendors, or our community at unnecessary risk. Your patience is much appreciated while we figure out how to provide the same great products and service we've always offered in this new and challenging business environment.