I bought and had installed a reproduction power booster unit from Ames (with Delco stamp) and my brakes (pedal) operate less easily than with the old booster unit I had in the car . I have been told since I have a cam in the car (.475 lift and maybe 1.6 rockers) I'm only pulling 12" of vacuum and the booster units are designed for 14" + vacuum but the old unit operated easier than my new one.
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