Im putting a Racecraft manual kit on my 86 iroc, its factory front disc/rear drum. Was wondering if i plumb it with the factory prop valve that was on it, get an aftermarket, or ive seen alot of guys not running a prop valve at all with the Strange master cylinder that comes with the kit.

 

you dont need a prop for the front brakes, you can plumb them direct, but you will need a adjustable valve , for the rears to get the bias right.