Interesting question-one I had never thought of! I see no reason the larger booster could not be used in place of the smaller one-that is what Rootes did when they started using the 7 inch boosters on the later cars. I don’t even think they changed the brake master cylinder bore size when they did this either so I don’t know how much less pedal pressure you can expect. Mounting it should be no problem as long as it is mounted in the same location that the factory used when they went to the 7 inch booster.
Are you using this on an Alpine or a Tiger? Not as much spare room to mount things on a Tiger! Good luck and let us know how the brakes work. Eric
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