vacum for break booster
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Most Holley carbs are taped for a fitting in the back side of the carb. There maybe a brass plug in the rear of the carb. You will have to look for it. (Under the rear float bowl)... I can't do that. If it's not there. Then sometime the Factory intake has a taped fitting in the intake that will require a 90* elbow fitting. For the vacuum source to the power brake booster...The same goes for the intake. If it's a very early Factory Intake you may not have a vacuum source in it. Back in the day Hi Po engines didn't have power brakes...(Do to Lack of a good vacuum). The cam was usually too big.If there isn't a fitting in either. Then you can look for a 1" spacer plate that has a port built into it, so you can run a vacuum source to the Power Booster...Or get creative and drill and tap a vacuum source in the intake manifold, for the power brake booster..You need engine vacuum for the power booster to operate properly...Bob
thank you for the imfo . i used the threaded vac line behind the carb ... havent fired it yet.maybe later