Thanks for all of the information everyone. I can confirm that the master cylinder I have appears to be a corvette disc/disc master cylinder. Sticking a piece of small wire into the outlet port it appears to be clear all the way to the piston so I agree that there appears to be no residual pressure valve installed in this master cylinder.
I will be adding the 10 lb residual pressure valve in line with each of the outlet ports. I am going to keep the 1.125 inch bore master cylinder since I have already purchased it and see how the pedal feels.
Thanks again.
