We did a bunch of testing on a friends 66 GTO and found out the only booster that equaled the original 11" stock unit was a dual diaphragm 9" booster. Neither the 7" or 8" dual diaphragm units offered much assist. I wouldn't go as far as saying the 9" was better than the 11" stock single, but I doubt anyone driving the car could tell them apart.
That said, the friends that have went to manual brakes with the smaller diameter master cylinder and the top hole in the brake arm have adapted quickly and have no remorse on the decision.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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