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When I was doing my MC search, I was able to find bore sizes for several MC and compared them to the stock 715 MC and found that the corvette non power had a large bore and physically looked to have, at the minimum, same or longer stoke. I figure more fluid moved and mine works really nicely. I posted the PN on the other zone once or twice. I'm real happy with it on a J truck booster with the pedal pushrod extended maybe and inch or so. Oh, and don't dick around with mediocre drums and pads or you'll be plagued with brake pull or low pedal...just my experience on these brakes.