Editing Carb vacuum port ID (section)
Jump to:
navigation
,
search
===Rochester Quadrajet=== It should be noted that Q-jet carbs prior to the introduction of the vacuum operated EGR system obviously will not have an EGR vacuum port. These carbs having an EGR vacuum port are mainly going to be from about ’71 or so and newer. There is one vacuum port on many Q-jet carbs that was used for the EGR valve. It is not suitable for use as a manifold ''or'' ported vacuum source. One problem in locating the EGR vacuum port on a Q-jet is, the EGR vacuum port is not always in the same location on all Q-jet carbs. It is often the port on the front passenger side of the carb, in the throttle body nearest to the idle mixture screw. If you don't have a port there, or you want to check it, one way to tell is to use a vacuum gauge- which you should be using anyway, come time to set the idle mixture screws, etc. The EGR port will ''sometimes'' have a larger diameter than the other vacuum ports (except the very large PCV and power brake ports), so it's a good practice to test those larger-sized ports for being an EGR port first. ====Quadrajet carb numbers that will likely have an EGR port:==== • 1971- 7041xxx • 1972- 7042xxx • 1973- 7043xxx • 1974- 7044xxx • 1975- 7045xxx • 1976-’79- 1705xxxx • 1980-up- 1708xxxx
|
Editing help
(opens in new window)
Personal tools
Log in / create account
Namespaces
Page
Discussion
Variants
Views
Read
Edit
View history
Actions
Search
Navigation
Main Page
Recent changes
Random page
Help
All articles
Start a new article
Hotrodders forum
Categories
Best articles
Body and exterior
Brakes
Cooling
Electrical
Engine
Fasteners
Frame
Garage and shop
General hotrodding
Identification and decoding
Interior
Rearend
Safety
Steering
Suspension
Tires
Tools
Transmission
Troubleshooting
Wheels
Toolbox
What links here
Related changes
Special pages
Terms of Use
Copyright
Privacy Policy
Your Privacy Choices
Manage Consent