Decision: 5x4 (SBP) or 5x4.5?

stroked340 said
Next to the superior quality of aftermarket they sure are..

stroked340 said
Fast enough..and smart enough to know NOT to run that factory ****!!!

Factory parts are designed to last a 100k miles or more without issues. That’s called reliability. It’s important to people that actually drive their cars. It’s a crap load more important than a few pounds of weight savings, because that doesn’t mean crap when your calipers are frozen up and your wheels don’t fit. If you’ve got a garage queen you can trade reliability for some bling, but off the track it’ll bite you.

Hey, I’ve got a question for you since you seem to be a Wilwood “expert”. How many miles have you put on your car since you installed those Wilwoods? Since I know they sat for a couple seasons when you scattered your engine back to back. And trailer to and from the track. Have you even cracked 100 miles yet? 1,000 ?

I put 70k on the 11.75’s on my Challenger. I’ve got probably 15k miles on my DoctorDiff 13” kit. Both are better brake kits for street driving.

Mattax said
Actually. A large percentage of old mopars road racing use factory braking systems.
It all depends on the sanctioning body, and with vintage racing groups the emphasis is running like it was back in the day.
And for autocross, the factory systems are more than adequate.
For track days, then you are free to use what you want. I'm not going to criticise anyone from using a lighter sytem or a larger rotor when there is a reason for it.
The O.P. said he wanted front power disks, but not for any specific competition or track use. So that's what I was trying to keep my comments to. Any of these options will work, and work pretty well if everything is matched up.

Heh. just noticed in mopax archive that there was some difficulty sourcing 11.75 x 1 rotors in 2014..
These things go in cycles. I wouldn't sweat it.

Exactly. The factory brakes are actually quite good. They were better than their competitors at the time, which is why Mopar was able to run them basically unchanged into the mid-eighties.

As for the 11.75’s, that’s not surprising. The 11.75” rotors only came on B/R bodies and only from ‘76 to ‘81. So they’re like A-body brakes in that respect, pretty limited production. Totally unlike the 10.87” disks and the 10x2.5” rear drums.