Doug, The Boss 302 book showed all ford part numbers for the conversion. Cobra Automotive is a rip off at 2100.00 They also don't use ford rotors, but some combination that appear to be Wilwood rotors and hats. I have to pick up the Boss 302 chassis book again. I beleive the Lincoln mounting brackets are simply re-drilled. I may buy the caliper brackets from Cobra Automotive, but 433.00 is pretty steep. I am not running the 15" 10 spokes, so there is no issue. They are 17" and a 4.5" offset. Did you find there was a noticable difference in braking with the 12" change over?
-Keith
That adapter is a Kar Kraft part. It was never in the Ford Parts Book. Yes the adapters are expensive. They've lowered their price because several people are making the adapters. I paid $600 for them, maybe $550, when they were the only source.
Is there a noticeable difference in braking? No. The value of the system is that the big rotors cool off faster BUT part of the issue is the Porterfield pads. You have to get them HOT!
I think one of the magazines did a comparison test and this set up was 30 or 40 feet shorter coming down from 100 and something? Maybe Mustang Monthly? Don't remember that specifically at the moment.
The other thing is that you need to mess with the master cylinder. They work MUCH better with the manual brakes and the 1-1/8" bore master. You can't use that with power brakes. It won't work with it.
The master for the power brakes is a 1" bore. With that set up they feel about the same as the stock calipers but I haven't tried them on the track as of yet. I think that the issue, if there is an issue, is that they are intended to have the crap beat out of them to make them work right.
They were designed for Trans Am racing and if you never saw that live, it was like an attempt at mass automotive suicide. Those guys were nutzzz!
They probably would have a better feel with regular heavy duty pads. I can't confirm that though since I haven't tried those.
I will point out that the T/A cars ran regular production brakes until someone at Kar Kraft engineered these for the Boss 302's for the 69 season.
Additional braking would be gained by increasing the od of the rotors. Something you need a larger wheel for but then, you are going to need to mess with the proportioning valve beyond what anyone has done with them as far as I know? I put the 65 adjustable unit in and it was good out of the box. What you would need to do for 14" rotors I don't know.
I wasn't telling you what to do, just warning everyone contemplating this swap who intended to use the 10 spokes. No one told me about it until I was into it. I ask Voght at Cobra Automotive and he said something like, "oh yea, I forgot to tell you that, but don't worry, we already did three '67s and all you need to do is machine the wheels".
Oh, you need to machine the reinforcing vein off of the face of the caliper to make it clear just about any wheel and you need to drill out the threads for the mounting bolts and reverse them. The left caliper goes on the right side and the right on the left side.