#1  
Old 11-25-2020, 06:42 PM
Hotrodjohn71 Hotrodjohn71 is offline
Senior Member
 
Join Date: Oct 2020
Location: Fair oaks Ca 95628
Posts: 223
Default power brake booster question

Group, can anyone share a photo of where the power brake booster vacuum line hooks in to the intake manifold? On my 1967 Firebird, I have an older motor that doesn't seem to have the same vacuum hookups on the intake manifold deck the stock one did.

  #2  
Old 11-25-2020, 07:41 PM
Hikin Mike's Avatar
Hikin Mike Hikin Mike is offline
Senior Chief
 
Join Date: Sep 2016
Location: Atwater, CA
Posts: 442
Default

The vacuum line goes to the baseplate of the carb, not the intake.

__________________
- Mike



'69 Firebird 400 - Goldenrod Yellow, 455 +.060, '6s-7' heads, Comp Cam 276AH-10 (51-309-4), TH400, Ford 9-inch w/3.08, 800cfm Q-jet, Stock Intake, Hooker Headers, Flowmasters
'68 Coronet 500 Convertible - Medium Gold Metallic, stock 318 +100,000 miles
The Following User Says Thank You to Hikin Mike For This Useful Post:
  #3  
Old 11-25-2020, 08:13 PM
Hotrodjohn71 Hotrodjohn71 is offline
Senior Member
 
Join Date: Oct 2020
Location: Fair oaks Ca 95628
Posts: 223
Default

Thank you. I've got a TH350 that will need vacuum also. The vac hose from the brake booster is a good size and that carb baseplate port is much smaller.
Do you think it can handle both the transmission and the booster both?
Attached Thumbnails
Click image for larger version

Name:	20201124_164953.jpg
Views:	90
Size:	57.1 KB
ID:	554768   Click image for larger version

Name:	20201117_134508.jpg
Views:	99
Size:	53.5 KB
ID:	554769  

  #4  
Old 11-25-2020, 08:40 PM
Hikin Mike's Avatar
Hikin Mike Hikin Mike is offline
Senior Chief
 
Join Date: Sep 2016
Location: Atwater, CA
Posts: 442
Default

I assumed you had a Quadrajet. No idea how the 2-bbl connects.

__________________
- Mike



'69 Firebird 400 - Goldenrod Yellow, 455 +.060, '6s-7' heads, Comp Cam 276AH-10 (51-309-4), TH400, Ford 9-inch w/3.08, 800cfm Q-jet, Stock Intake, Hooker Headers, Flowmasters
'68 Coronet 500 Convertible - Medium Gold Metallic, stock 318 +100,000 miles
  #5  
Old 11-25-2020, 11:10 PM
Hotrodjohn71 Hotrodjohn71 is offline
Senior Member
 
Join Date: Oct 2020
Location: Fair oaks Ca 95628
Posts: 223
Default

What would you think about putting a tee in that big pcv line to enable vacuum to the booster?

  #6  
Old 11-25-2020, 11:31 PM
Hikin Mike's Avatar
Hikin Mike Hikin Mike is offline
Senior Chief
 
Join Date: Sep 2016
Location: Atwater, CA
Posts: 442
Default

I don't see why not.

__________________
- Mike



'69 Firebird 400 - Goldenrod Yellow, 455 +.060, '6s-7' heads, Comp Cam 276AH-10 (51-309-4), TH400, Ford 9-inch w/3.08, 800cfm Q-jet, Stock Intake, Hooker Headers, Flowmasters
'68 Coronet 500 Convertible - Medium Gold Metallic, stock 318 +100,000 miles
  #7  
Old 11-26-2020, 09:36 AM
Kenth's Avatar
Kenth Kenth is offline
Ultimate Warrior
 
Join Date: Feb 2003
Location: The Kingdom of Sweden
Posts: 5,457
Default

You will need a 1/8" NPT fitting for 3/8" hose to the brake booster, threaded into the fitting already sitting at rear of base plate.
Attached Thumbnails
Click image for larger version

Name:	2bbl.PNG
Views:	95
Size:	107.3 KB
ID:	554789  

__________________
1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
  #8  
Old 11-26-2020, 10:34 AM
north's Avatar
north north is offline
Ultimate Warrior
 
Join Date: Oct 2006
Posts: 6,388
Default

Here is a picture of a 69 2bbl engine with TH400, AC and power brakes. looking from above at the back of the carb.
Attached Thumbnails
Click image for larger version

Name:	2015-12-01 024.jpg
Views:	95
Size:	74.4 KB
ID:	554792  

__________________
My Break Away Squad
1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops)
1969 LeMans (2dr & 4dr Hardtop and a Cvt)
1969 LeMans Safari 2 seat Wagon
1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop)
1969 Catalina (3 Cvt’s & a 2dr hardtop)
1969 Ventura 2 Seat Wagon
1969 Executive 4dr Sedan
1969 Bonnie Cvt
1969 Bonnie 3 Seat Wagon (2 of them)
1969 Bonnie Brougham (4dr Hardtop & Cvt)
1969 Grand Prix SJ (2 of them)
1969 2+2 2dr Hardtop (Canadian model)
  #9  
Old 11-26-2020, 11:48 AM
Hotrodjohn71 Hotrodjohn71 is offline
Senior Member
 
Join Date: Oct 2020
Location: Fair oaks Ca 95628
Posts: 223
Default

Ok thank you for that photo north and the advice from Hikin Mike and Kenth. I guess that settles it. I would have thought that port behind the carb was too small to supply a big brake booster and transmission but if it was good enough for Pontiac, it's good enough for me

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 07:29 PM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 




Copyright © 2017