1981 with 383 stroker, vacuum issue
Thread Starter
Racer
Joined: Jan 2013
Posts: 300
Likes: 10
1981 with 383 stroker, vacuum issue
Because this engine is running a Holley Demon carb it blocks off the main vacuum port at the rear of the intake. SO a electric vacuum pump was added which the bubba who installed it screwed up the wiring and it does not work. I can fix the wiring but is there any other options for a vacuum source from the manifold?
Team Owner
Joined: Jan 2007
Posts: 53,648
Likes: 878
From: Southern Cal Ca
St. Jude Donor '22
Because this engine is running a Holley Demon carb it blocks off the main vacuum port at the rear of the intake. SO a electric vacuum pump was added which the bubba who installed it screwed up the wiring and it does not work. I can fix the wiring but is there any other options for a vacuum source from the manifold?
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
Go to Ebay and in the motors catagory, type in the search box:
Low Profile Vacuum fittings.
I have the same issues. There are a couple fittings on there that look real promising. One has a photo of a Demon carb clearing the fitting. I believe you will need a 3/8 NPT. Then you can decide if you want 1,2, or 3 ports off of that.
Low Profile Vacuum fittings.
I have the same issues. There are a couple fittings on there that look real promising. One has a photo of a Demon carb clearing the fitting. I believe you will need a 3/8 NPT. Then you can decide if you want 1,2, or 3 ports off of that.
Last edited by HeadsU.P.; Jan 5, 2018 at 08:45 PM.
