I agree with Bob S. I had a 67 camaro with power drums and they almost killed me once with brake fade from a high speed stop. Felt like I hit a patch of butter, scared the crap out of me. Then I had a stock disc setup that was out of a 70 nova installed with the single piston calipers and it stopped amazing. It stopped so well I can't understand why anyone would need 4 wheel disc or huge willwoods etc. Actually my 68 Firebird has power drums and i just bought a set of stock 70 chevelle discs to put on it. Only time will tell if they work as well as i expect them to.