[eschaider]

The other possibility, Mike, would be to use rotors and calipers from a different point in the SPF production run. For example:

Cars 700-2636

Front Rotors: 1978-1990 Redrilled GM Full size
Rotor Diameter: 12 inches
Min Thickness: 0.965 inches
Max Thickness: 0.980 inches
Pads & Caliper Application: Wilwood JL-120-1504

Rear Rotors: 1989-1992 T-Bird
Rotor Diameter: 10 inches
Min Thickness: 0.950 inches
Max Thickness: 0.896 inches
Pads & Caliper Application: Wilwood FS-120-6805


Cars 2637-2792

Front Rotors: 1978-1990 Redrilled GM Full size
Rotor Diameter: 12 inches
Min Thickness: 0.965 inches
Max Thickness: 0.980 inches
Pads & Caliper Application: Wilwood 4 Piston (I don't have a p/n but SPF or Wilwood will)

Rear Rotors: Wilwood 160-0471
Rotor Diameter: I don't have this data
Min Thickness: I don't have this data
Max Thickness: I don't have this data
Pads & Caliper Application: These brakes are the Australian single piston brakes with an integrated parking brake. I would avoid these just because of the challenge in getting service parts. Stay State-side and life will be easier


Cars 2638- Present

Front Rotors: 1978-1990 Redrilled GM Full size
Rotor Diameter: 12 inches
Min Thickness: unspecified
Max Thickness: 0.810 inches
Pads & Caliper Application: Wilwood 4 Piston (I don't have a p/n but SPF or Wilwood will)

Rear Rotors: Wilwood 160-5840
Rotor Diameter: 11 inches
Min Thickness: 0.810 inches (This thickness is as the rotor comes new. Wilwood allows for no machining of this rotor)
Max Thickness: —
Pads & Caliper Application: Wilwood single 34mm piston w/integrated parking brake. Two part #s are shown. The first is 120-10246 and the second is 120-10247. I think it is a left vs right sort of thing but I can't recall anymore.


Probably the easiest retrofit would be the car 700-2636 brake system. It is all Wilwood except for the rotors which are all US retail market service items.

If you elect to use the 700-2636 approach there is a flat plate that bolts to the spindle to position the Wilwood caliper correctly for the rotor. Wilwood calls these items bracket kits. The plate might be a Wilwood or might be an SPF item. You can be fairly certain which ever way is more difficult for you will be the way the everything sorts out. That plate would need to be ordered from Hilbank or sometimes they might give you a print copy for you to make the item yourself. With brakes they might be a little touchy about your making parts yourself because of the risk of brake failure if there were a whoops.

The other thing, I didn't think of but should have is to ask Wilwood to supply one of their bracket kits to mount their calipers. They might have a kit. The Wilwood calipers work very well, especially if you go up one step in their pad line up, which is rather extensive.

Hope this helps. Superformance used to publish a bulletin with all this data. I don't know if they still do. The CC website rejects the pdf file otherwise I would post it.

p.s. Another thing to keep in mind is the fact this SPF info is twenty or so years old. That means some of the Wilwood part #s may have been superseded with more recent product. If they have, Wilwood can easily do the crossovers for you.