[Big Mike]

I just a set of Wilwood disc brakes on the rear of my 1968 LeMans drag car. The master cylinder is pitted and beyond rebuilding. I used a master cylinder off of a manual front disc "A" body car when I changed the front to Wilwood discs.
Since I am going to replace the master cylinder, I am considering using a master cylinder from a 79 4 wheel disc "F" body car with manual disc brakes. The manual cylinder has a 1" bore. The power assisted cylinder has a 1.25" bore. It is very difficult to locate a manual cylinder, only few places even list a replacement. Autozone & NAPA have one in stock for power assisted discs. I am willing to try the larger bore cylinder only because the calipers have 4 pistons instead of the one like the stock calipers use. What do you think? Will the pedal effort be too great? Lots of adrenaline at the finish line, I don't think I'll have a problem.....

Big block? Small Block? Nope, It's a Pontiac Engine!