This rear disc conversion will work fine with a stock type '71-'87 front disc conversion, but you will have 5 lug on the front and 6 on the rear. Yes you need to change the master cylinder to a disc/disc master and the proportioning valve needs to be either a fixed disc/disc valve or an adjustable valve in the rear circuit.
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Originally Posted by vortech71chevy
Nice! I'd love a set. My question is- would this rear disc setup pair well with stock 71-87 front discs? Or do I need to upgrade? Do I need to swap master cylinders or proportioning valves?
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