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Can I use this port on a Q-Jet manifold for the brake vac line or PCV line?

blazer74 said:
What about your vacuum advance for the dizzy.
Your trans requires constant vac to up shift correctly.
Some egr vac ports will zero at idle and also reduced with the throttle open and tend to be larger.

Make sure you have manifold vac at idle and full vac with the throttle open

View attachment 229436
Click to expand...

The Holley I have has the vac advance port which is hooked to the vac advance om the dizzy. A 3/8" port on the passenger side which the brakes are hooked to (I want to route my pcv vac line there) and it has a small vac port on the base plate under the front metering block, roughly the same diameter as the th350 vac hard line.
 
I'll pull out the vac gauge and hook it up to that one small capped off port and see what the gauge reads.
 
Would T'ing the brake booster vac line and the th350 vac line togethet be an issue.

Using the vac port on the intake in front of the dizzy?
 
Manifold vac will be full all the time.
Ported vac will be zero at idle and full off idle
Reduced vac ports usually for egr are not full vac off idle. They have a bleed off port that reduced vac and is not suitable for trans/dizzy or any other acc that requires full vac.
You may not have that on yours.
The small one you found could be manifold or ported.
 
handloader90 said:
Would T'ing the brake booster vac line and the th350 vac line togethet be an issue.

Using the vac port on the intake in front of the dizzy?
Click to expand...

Big ports for brakes and pvc. You can T together the trans and dizzy.
See what that new port u found does.
You could use the brake and trans together if u need to.
 
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