Vacuum boss for power brake booster on an early '63 intake manifold

[Ruud Z.]

On my early L75 '63 I do have the correct (early) #3799349 intake manifold, which has no power brake boss behind the carburetor mounting flange.
Since I would like to equip my car with power braking and I do have the original power brake booster and master cylinder, I would like to know where these early cars got their vacuum from. Was the J50 power braking option only avaible on later cars with the later (after 3/4/63) #3844459 intake manifold ? It seems there is a possibility to get vacuum from the AFB carburetor-base, I saw some pictures in Noland Adams book (page 127) where the vaccum was drawn from the base of the (AFB)carburetor where also the PVC valve was hooked up with a T-fitting. What is the correct (safest) way to do this? Thanks Ruud

[Edward J.]

Re: Vacuum boss for power brake booster on an early '63 intake manifold

Rudd, you can get that vacuum fitting from LI corvette, The carb base at the rear is the way the factory sourced the vacuum for power brakes.

[John H.]

Re: Vacuum boss for power brake booster on an early '63 intake manifold

Ruud -

That fitting (GM #3825961 tee) that provides the vacuum source (and also accommodates the PCV hose) is shown in your Assembly Manual in section J50, sheet 3.00, item #10.