[alanmay0]

Hello I recently bought a 67 GTO and it had an elderbrock aluminum intake and carb on it. I bought a correct 67 intake manifold and then I also bought a quadrajet carb for it. The carb is off of a 455 oldsmobile, i believe. Anyway the carb does not have a vacuum port in the rear for the power brakes. So I am thinking of getting a aluminum spacer with a port to solve my problem. Thing is there are so many spacers I am not sure which one will work with the quadrajet. any thoughts?
thanks

[PAUL K]

A four hole spacer would probably be the better choice for a stock type engine. You might gain a little bit of power by opening up the divider between the secondary holes.

[alanmay0]

any brand or part number?

[F ROCK]

mine uses a port on the intake, in front of the carb, for brakes.

[ZeGermanHam]

If I was in the market for a carb spacer, I'd probably get one from Wilson Manifolds: https://www.wilsonmanifolds.com/coll...red-carburetor

[Cliff R]

The correct 1967 intake will have the "hot slot" across the front. It requires the correct gasket and stainless steel heat shield over it. You will need that configuration unless the holes at the end of the U shaped channel are blocked off, and even then without the correct gasket you may end up with a vacuum leak as one side of the slot extends out pretty far and only a few available gaskets will effectively seal it off.

Not sure which Olds carb you are trying to use, part number would help, but they are easily drilled and tapped for 1/8" NPT thread to add an 1/8"NPT to 3/8" hose fitting so not spacer would be needed.........Cliff

[Kenth]

Originally Posted by F ROCK

mine uses a port on the intake, in front of the carb, for brakes.

That port, and the port below, is for the PCV-system, NOT the brakes.
Using one of these ports your brakes will have reduced vacuum from only four cylnders.

[Kenth]

Originally Posted by alanmay0

Hello I recently bought a 67 GTO and it had an elderbrock aluminum intake and carb on it. I bought a correct 67 intake manifold and then I also bought a quadrajet carb for it. The carb is off of a 455 oldsmobile, i believe. Anyway the carb does not have a vacuum port in the rear for the power brakes. So I am thinking of getting a aluminum spacer with a port to solve my problem. Thing is there are so many spacers I am not sure which one will work with the quadrajet. any thoughts?
thanks

Do not make it more difficult than necessary.
Drill a hole in the back of the throttleplate and thread 1/8" NPS for a 1/8" NPT fitting.
OR, use the PCV port on carb for the power brakes. No drilling needed.

[Jeff Hamlin]

This is what I needed on a current project, to mount the Ed carb onto the factory Q-Jet manifold.

[Kenth]

Originally Posted by Jeff Hamlin

This is what I needed on a current project, to mount the Ed carb onto the factory Q-Jet manifold.

Not needed to mount an Olds Qjet on a 1967 GTO intake.

[alanmay0]

ok what are you calling the throttle plate. you talking about the carburetor itself?

[alanmay0]

It is needed if I want to run my power brake booster from the rear of the carb. Do not want to run a rubber hose around the back of the carb to the front where there are vacuum ports. Would look like crap to me.

[Cliff R]

Your answer and solution was in my first response. I also mentioned that a carburetor part number would help, never got one.

The Olds baseplate is not drilled and tapped, but the passage is there. Drill and tap for 1/8" NPT threads directly into the back of the baseplate in the center. It's not fussy. Then tap for 1/8" NPT threads and install an 1/8"NPT to 3/8" hose fitting, run a 3/8" hose to the brake booster.....done.....

[Jeff Hamlin]

Originally Posted by Kenth

Not needed to mount an Olds Qjet on a 1967 GTO intake.

My bad, misread his post.

[alanmay0]

OK the carburetor # is 17056252. I have attached a few pictures of the carb so that you may better understand my situation. At the back of the carb there is one vacuum that goes to whatever it is. If you look at the picture of the car upside down you can see that it would be very difficult to add a vacuum port. I do not know how large of a vacuum hose you need going to the brake booster. It is a 3/8 hose or a 1/2" hose or something else? How large of a diameter hose do you need to power the brake booster? Let me know what else you need.

By the way I will be removing the large fuel filter sticking out from the front of the carb so that I can use the original fuel line. I will but a inline fuel filter in. What can or do i need to bring that huge 1" diameter opening down to the size of the fuel line. If anyone knows.
Thanks
alan

[Tim Corcoran]

You need to drill and tap a hole in the rear center of the base plate of the carb to 1/8 pipe threads. The hose for your power brakes is 3/8" and there is a fitting that screws into the carb (1/8" NPT) and a 3/8 barbed on the other end for the power brake hose.

[Kenth]

Originally Posted by alanmay0

ok what are you calling the throttle plate. you talking about the carburetor itself?

A picture of the throttle plate and a link for short fuel inlet fitting an related gasket, filter and spring. No need for external filter.

The threads in throttle plate for the 1/8" NPT (National Pipe Tapered) 11/32" power brake hose fitting are 1/8" NPS (National Pipe Straight).

https://www.carburetion.com/Products...x?Part=CUD3914

[Cliff R]

I sell those here and would use the high flow micro-screen fuel filter instead of the small paper one.

https://cliffshighperformance.com/

I would NOT for any reason run an in-line filter with rubber hose and clamps, very dangerous on the pressure side of the fuel system..........