booster & mc

my car has stock power brakes on it,and drums all the way around,how do i know if the booster is a dual diaphram,apperently with the new cam i will be useing i will need a dual diaphram booster is this true? i'm going to be switching to discs shortly..thanks cranker

I don't think any of the factory boosters were dual setups. There are lots of aftermarket dual boosters. It comes down to how many square inches of surface area the bssoter has. For example, a dual 8" has as much or more surface area as a factory single 11" unit. The greater the surface area, the less vacuume is needed to generate the same force.
Ron

my car has stock power brakes on it,and drums all the way around,how do i know if the booster is a dual diaphram,apperently with the new cam i will be useing i will need a dual diaphram booster is this true? i'm going to be switching to discs shortly..thanks cranker

What cam is that?

274 comp,490 lift

That cam isn't that radical. You will probably be right on the edge of even needing a vacuum reservior with the stock booster. I would add a reservior to be extra-safe. Should be no problem then.

thanks for the info..

thanks for the info..

I had a 280 Crane Cam in my 74 with factory power disc brakes, no problems at all. The rest of the combo was pretty mild so results may vary.