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#1 |
Registered User
Join Date: Sep 2020
Location: Osborne
Posts: 16
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Power brakes
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. |
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#2 |
Senior Member
![]() Join Date: Jun 2022
Location: San Ramon,CA
Posts: 504
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Re: Power brakes
It's the hex shaped fitting on the back of the manifold. I got one with 3 ports from Corvette Central, p/n 303313
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1970 C10 Custom longbed 350/350 |
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#3 |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,699
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Re: Power brakes
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.
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#4 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,115
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Re: Power brakes
Good work on finishing the project! It will serve as a reminder of your friendship and the times you shared.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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#5 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,602
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Re: Power brakes
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#6 |
Registered User
Join Date: Apr 2022
Location: Moorpark, CA
Posts: 756
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Re: Power brakes
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.
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#7 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,260
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Re: Power brakes
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.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#8 | |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,488
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Re: Power brakes
Quote:
You'll find they have a lot of adjustability, even the least expensive street models.
__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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#9 | |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,260
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Re: Power brakes
Quote:
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.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#10 | |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,488
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Re: Power brakes
Quote:
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. ![]()
__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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#11 | |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,260
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Re: Power brakes
Quote:
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.
__________________
Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#12 | |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,488
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Re: Power brakes
Quote:
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__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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