Power brakes

[72kat]

I have a 72 c10 with 350 and 350 turbo. Was fixing it up with a buddy who was the brains of the operation. He unexpectedly passed away a month ago.
I seriously thought about selling the truck off as its a huge reminder. But recently, I thought damnit I'm going to finish it for him.

We put a edelbrock aluminum intake on it and a Holy 670 cfm street avenger carb. The truck has regular brakes (disks in front, drums in rear). We were going to upgrade the brakes to power brakes, but I'm not sure where to connect the vacuum line from the canister. Somewhere on the carb? Somewhere on the manifold?

Any help appreciated.
Thanks.

[Rust_never_sleeps]

It's the hex shaped fitting on the back of the manifold. I got one with 3 ports from Corvette Central, p/n 303313

[RustyPile]

The booster vacuum hose needs to be connected to a large vacuum port on the intake manifold. That carburetor may have a large vacuum port at the rear of the throttle body. Connect the PCV hose there. Your aftermarket intake manifold may or may not have enough vacuum ports for everything. Some may need to be added. If it has a tapped hole between the carburetor flange/gasket area and distributor, install the factory fitting there and connect the transmission modulator vacuum hose and brake booster hose to it.

[HO455]

Good work on finishing the project! It will serve as a reminder of your friendship and the times you shared.

[geezer#99]

There’s a diagram in here for what ports to use.


https://documents.holley.com/199r10219-3.pdf

[72SB]

The Edelbrock intake should have a NPT plug near cyl 8 runner. Get a NPT elbow to 3/8 barb to connect to brake booster hose.

['68OrangeSunshine]

I am sorry for your loss.
20 Years ago, I had to switch from a Holley carb to an Edelbrock because my Holley Guy was going thru an excruciating divorce. I needed a carburetor I could work on myself.
Also my regular mechanic/buddy came down with the Long Covid, and just doesn't want to work on trucks.
I must become more self reliant.

[MikeB]

Originally Posted by '68OrangeSunshine

I am sorry for your loss.
20 Years ago, I had to switch from a Holley carb to an Edelbrock because my Holley Guy was going thru an excruciating divorce. I needed a carburetor I could work on myself.

If you can work on an Edelbrock, you should be able to work on a Holley. There are lots of Holley how-to books out there. Buy one and don't be intimidated!

You'll find they have a lot of adjustability, even the least expensive street models.

['68OrangeSunshine]

Originally Posted by MikeB

If you can work on an Edelbrock, you should be able to work on a Holley. There are lots of Holley how-to books out there. Buy one and don't be intimidated!

You'll find they have a lot of adjustability, even the least expensive street models.

Really my Edselbrock is a Carter AFB. But I decided I disliked Holleys every time I had a back fire and had to replace the Power Valve. Then the carb had to be set up again.
The AFB design doesn't have that flaw. After 250,000 miles on my last 292 with a 4160, R8007 390 CFM 4V Holley I was OK with it. But I always needed an Expert. When we got my present 292 build on the road in 2005, the 4160 was fine for the 500 mile break in. Then, on the way to work, it backfired for no reason. We couldn't get it to set up anymore. Warped base plate was the assumption. I looked into a separate base plate, but the price of a 500 CFM EDL-1404 [AFB Clone] was about the same, so I dumped the Holley.
Some people love them. I'm not one.

[MikeB]

Originally Posted by '68OrangeSunshine

But I decided I disliked Holleys every time I had a back fire and had to replace the Power Valve.

I had to replace the power valve in my first Holley back in the 1990s. No backfire that I recall, but it all of a sudden would bog when trying to go up even a slight hill. No idea what caused the blow-out.

For years now the carbs have had some kind of check valve that prevent blow-outs. I've never even looked into how it works, but never had another blow-out.

The only old vehicle I have now is my 69 C10, and it has a very old Edelbrock #1406. It works just fine, but I'm thinking about an AVS2 just because.

['68OrangeSunshine]

Originally Posted by MikeB

I had to replace the power valve in my first Holley back in the 1990s. No backfire that I recall, but it all of a sudden would bog when trying to go up even a slight hill. No idea what caused the blow-out.

For years now the carbs have had some kind of check valve that prevent blow-outs. I've never even looked into how it works, but never had another blow-out.

The only old vehicle I have now is my 69 C10, and it has a very old Edelbrock #1406. It works just fine, but I'm thinking about an AVS2 just because.

I used to hafta keep a spare 8.5''Hg Power Valve in my glovebox. I guess they fixed that issue, but it was too late for me.

Sorry about the rabbit hole. I think I was trying to suggest Self Reliance to the OP.

The 1405 is what I think of as an equivalent to my Federal Mogul Carter AFB 9635S. I use the Edelbrock manual. Same as a 1406 but with manual choke. That's on a 350 in my '71 GMC Jimmy. [~600 CFM]
The 292 in the '68 Stepside has a 1404, manual choke but 500 CFM.

[MikeB]

Originally Posted by '68OrangeSunshine

Sorry about the rabbit hole. I think I was trying to suggest Self Reliance to the OP.

Yeah, we've kinda taken this thread off-track.