I have to agree with Richard on the proportioning valve. This same subject came up this very weekend while bench racing with two very experienced car builders. One ('34 Ford with 350ci) said the valve was unnecessary on that car, the other ('48 International panel) said they were a good thing. I would think a proportional valve that is pressure adjustable might be a good idea for 'dialing' in the correct pressure. As far as residual valves go...I think we all use them here. My M/C is low under the foorboards and they are recommended for that type of setup. Many M/C have residual valves mounted in the body of the M/C. I remember reading somewhere that you can take a stick like a wooden qtip and run it inside the ports. If it goes in just a little then the M/C has the valves inside the body.
In all fairness to Richard. He hit my problem right on the head. I had no more room in the frame area for a booster bigger than 7 inches. I had to give up pedal travel for pressure. If I could have gone with say...a 9 incher, the smaller piston may have not been necessary.
