Ported or Manifold Vacuum Question
Thread Starter
Racer
Joined: Dec 2010
Posts: 281
Likes: 4
From: Holbrook MA
Ported or Manifold Vacuum Question
I've read that our motors run best with manifold vacuum for the dist vacuum advance. My 77 L48 has the vac advance connected to a vacuum port on the drivers side front of the carb. Is this manifold vacuum, and if not where should I connect it to?
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
If it's above the carb butterflies, it's "ported".
Manifold vacuum comes from a port below the butterflies, or a nipple on the power brake fitting...which may require a new fitting with an available nipple.
Manifold vacuum comes from a port below the butterflies, or a nipple on the power brake fitting...which may require a new fitting with an available nipple.
Safety Car
Joined: Oct 2000
Posts: 3,593
Likes: 103
From: Southern Indiana
http://www.lbfun.com/Corvette/Tech/vettetech.html
Here is everything you need to know about your timing, just scroll down and find the subject on the above link.
Here is everything you need to know about your timing, just scroll down and find the subject on the above link.
