Interesting you're using a disc/drum master (as I am). I got mine off a car with huge 11 x 2 rear drums so I figured the capacity would be close. I'm just curious as to how you came to that decision on your car. By the way, I'm not using a prop valve, I tee'd the fronts and then put an adjustable valve on the rears.
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 "GTO......Gas, Tires and Overdraft"!
'70 GTO convertible, 434, 4-speed
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