Where to get vacuum?
Thread Starter
Instructor
Joined: Jan 2004
Posts: 101
Likes: 0
From: New Orleans Louisiana
Where to get vacuum?
Wondering if y'all can give me a little help. I have a 71 with 350 and TH400 auto tranny. Running a Weiand Action Plus intake and now I'm swapping from a fake Quadrajet to a 750 Speed Demon. My question is that now I don't have enough vacuum sources with the Demon.
I have two on the side of the carb. One for distributor and the other for vacuum accessories. There's one on the back of the carb that I was going to use for the power brake booster. Then I have my tranny modulator plugged into a fitting directly on the intake manifold.
But I don't have any place to put my PCV line! The Quadrajet had more vacuum lines than the demon. So, where do I run a line for the PCV? I'm thinking I shouldn't split a line between the tranny or the brakes, right? Sounds like trouble there. Or would it be ok? Or is there some other solution that I'm blatantly missing. Should I get a carb spacer that has a vacuum fitting installed? Do they make such a thing?
Thanks in advance for your advice!
I have two on the side of the carb. One for distributor and the other for vacuum accessories. There's one on the back of the carb that I was going to use for the power brake booster. Then I have my tranny modulator plugged into a fitting directly on the intake manifold.
But I don't have any place to put my PCV line! The Quadrajet had more vacuum lines than the demon. So, where do I run a line for the PCV? I'm thinking I shouldn't split a line between the tranny or the brakes, right? Sounds like trouble there. Or would it be ok? Or is there some other solution that I'm blatantly missing. Should I get a carb spacer that has a vacuum fitting installed? Do they make such a thing?
Thanks in advance for your advice!
Le Mans Master
Joined: Apr 2004
Posts: 7,106
Likes: 38
From: Newark DE
you can tee off one of the other lines for the PCV but i wouldn't do it on either the PB booster line or the tranny line. Any other full manifold vacuum line should be OK.
If needed you could also drill and tap to fit another port directly in the intake
If needed you could also drill and tap to fit another port directly in the intake
