Brake booster vacuum source - The 1947 - Present Chevrolet & GMC Truck Message Board Network

KEH · 03-30-2003, 12:34 AM

I just added a brake booster. Where should I hook up the vacuum hose? The 2 sources at the carb base are used for the distributer advance, and pcv valve. Do I need a T or is there another place to hookup. Thanks.

Ken

gr8scott51 · 03-30-2003, 12:42 AM

You can buy an carb spacer block with a vacuum port.

cdowns · 03-30-2003, 01:05 AM

directly from the manifold. on the 350 there's a port you can use that is directly in back of the carb and in front of the distributor. i'm not familar with 6cyl so i dont know about that

KEH · 03-30-2003, 01:09 AM

The port on the back up the carb is where the pcv valve is plugged in. Do most just T off of that?

cdowns · 03-30-2003, 01:58 AM

NO NOT OFF THE CARB OFF THE MANIFOLD!!

Project1970 · 03-30-2003, 06:35 AM

Anywhere you're getting full manifold vacuum would be fine. If there's not a port on the manifold directly (in which case I'd be slightly surprised if it's a V8) you should be fine T'ing in on the one on the back of the carb.

Blue Beard · 03-30-2003, 10:18 AM

Mine comes off the manifold................

Longhorn Man · 03-30-2003, 12:13 PM

There is nothign wrong with going from the carb.
On the intake there should be a plug somewhere with a 1/2 inch (or so) pipe plug, get a fitting for that if you have no carb provisions.

KEH · 03-30-2003, 05:55 PM

Sorry cdowns. It would help if I would have read your post closer. Yes I do have the manifold plug you described. On my way to get a fitting.

Thanks for the help guys.

*racedvl* · 03-30-2003, 06:14 PM

I say go to the junkyard and find the "t" behind the carb, on a car/truck with power brakes. Install that into your manifold.

03-30-2003, 12:34 AM	#1
KEH Better late than never Join Date: Dec 2001 Location: Columbus, IN Posts: 324	Brake booster vacuum source I just added a brake booster. Where should I hook up the vacuum hose? The 2 sources at the carb base are used for the distributer advance, and pcv valve. Do I need a T or is there another place to hookup. Thanks. Ken __________________ 1970 C/10 SWB Stepside

03-30-2003, 12:42 AM	#2
gr8scott51 Registered User Join Date: Mar 2003 Location: Bremerton, WA Posts: 1,839	You can buy an carb spacer block with a vacuum port. __________________ Silence is golden, duct tape is silver. - Scott

03-30-2003, 01:05 AM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	directly from the manifold. on the 350 there's a port you can use that is directly in back of the carb and in front of the distributor. i'm not familar with 6cyl so i dont know about that __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

03-30-2003, 01:09 AM	#4
KEH Better late than never Join Date: Dec 2001 Location: Columbus, IN Posts: 324	The port on the back up the carb is where the pcv valve is plugged in. Do most just T off of that? __________________ 1970 C/10 SWB Stepside

03-30-2003, 01:58 AM	#5
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	NO NOT OFF THE CARB OFF THE MANIFOLD!! __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

03-30-2003, 06:35 AM	#6
Project1970 14.1 @ 96MPH Join Date: Jul 2001 Location: Mesa, AZ Posts: 2,811	Anywhere you're getting full manifold vacuum would be fine. If there's not a port on the manifold directly (in which case I'd be slightly surprised if it's a V8) you should be fine T'ing in on the one on the back of the carb. __________________ Project1970 - LS1 Swap Complete!

03-30-2003, 10:18 AM	#7
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,831	Mine comes off the manifold................ __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

03-30-2003, 12:13 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	There is nothign wrong with going from the carb. On the intake there should be a plug somewhere with a 1/2 inch (or so) pipe plug, get a fitting for that if you have no carb provisions.

03-30-2003, 05:55 PM	#9
KEH Better late than never Join Date: Dec 2001 Location: Columbus, IN Posts: 324	Sorry cdowns. It would help if I would have read your post closer. Yes I do have the manifold plug you described. On my way to get a fitting. Thanks for the help guys. __________________ 1970 C/10 SWB Stepside

03-30-2003, 06:14 PM	#10
racedvl Account Suspended Join Date: Jan 2000 Location: Woodstock, IL Posts: 7,020	I say go to the junkyard and find the "t" behind the carb, on a car/truck with power brakes. Install that into your manifold.

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