manifold vacuum on chevy 350

ranger

 
 
Joined
Jan 18, 2003
Messages
1,169
Location
Mountain Hole, Idaho
There is a vacuum port 2nd picture right under the airfliter. It is capped with a black cover, loooks like it is on the metering block. Also another source is where your vacuum advance for your distributor. You should also have a tap on the manifold inbetween the carb and the dist.
 

65swb45

Elder Statesman
Supporting Vendor
 
 
Joined
Apr 14, 2004
Messages
25,087
Location
818-953-9230
Depending on what you need the vacuum source for, you might be able to T into the line for your brake booster as well.
 
Joined
May 16, 2005
Messages
55
Location
Up 4
On my Holley carb there is a full manifold vacuum port right next to the PVC vacuum connection. Not sure if all Holley's are the same though. I would go to the Holley web site as it has online manuals for most of their carbs.
 
Joined
Dec 20, 2004
Messages
257
Location
Charlotte NC
Ok I am still trying to find more than one manifold vacuum source. Could I tap into the brake booster if I was using the vacuum for my th350 transmission? Are these manifold vacuum sources as well?
 

lingo

 
Joined
Apr 8, 2005
Messages
778
Location
Nashvegas
be sure to look on the manifold to see if there is a plug (threaded pipe type) that is in one of the intake runners. if not then the answer would be yes that is the only manifold vaccuum
 

lingo

 
Joined
Apr 8, 2005
Messages
778
Location
Nashvegas
oh yeah, i would also find a way to route that return spring away from the radiator hose. bad corrosion. maybe toward the rear off of the bottom of the bracket
 

theo

 
Joined
Feb 19, 2002
Messages
1,432
john0089 said:
Are these manifold vacuum sources as well?
Nope. Those are just threaded bosses for mounting stuff.

Like ranger and lingo both suggested, Chevy intakes often have a plugged port behind the carb. It's a common place to get brake booster vacuum. If your Edelbrock has it you can replace the plug with a barbed fitting and be good to go. :)
 

lingo

 
Joined
Apr 8, 2005
Messages
778
Location
Nashvegas
you may be able to find a vacuum "tree" and replace the nipple this would give you more options and then you could plug what you don't need.
 
Joined
Dec 20, 2004
Messages
257
Location
Charlotte NC
I got a t fitting and put it on the manifold vacuum with the brake booster. Do you think it will work?
 
Last edited:
Top Bottom