|
By seishank65 - 5 Years Ago
|
I have these 2 unknown ports on my intake manifold does anyone know what they are? I'm trying to find a vacuum port to connect a vacuum gauge. 
|
|
By DryLakesRacer - 5 Years Ago
|
|
They are not vacuum ports. They are for the carb choke. The one on the left has a tube going up to the carb near the top and draws air thru the exhaust crossover to the choke with clean air. The one on the right has been added. It should come out on the lower part of the crossover where some one has put a plug. There are repair kits for these..
|
|
By oldcarmark - 5 Years Ago
|
The Second One looks like an Aftermarket fitting to heat the Choke Cap instead of using the original Setup. That "Heat Stove" is usually installed in the Exhaust Manifold. It should closed at the bottom of the Opening-not open to direct Exhaust Heat. I don't think there is a place to hookup a Vacuum Gauge as the Manifold is now. The Vacuum outlet was part of the Carburetor Baseplate on the Teapot Carb.Is there an outlet at the back of Manifold where Power Brake outlet was located?
If not U may have to drill and Tap for a Vacuum Outlet. If You are changing Carbs to new style Holley or other there should be a Vacuum Outlet or 2 on the Carb.
|
|
By seishank65 - 5 Years Ago
|
|
Thanks for the reply. Any ideas where I can get Vacuum from? Should I just T off the vacuum coming from the dizzy into the carb? I'm using an Edelbrock 1406 and using the vacuum port on the drivers side of the carb.
|
|
By darrell - 5 Years Ago
|
|
drill and tap a hole in the back.a picture of another manifold will show you where to drill.this is a 56 intake why they didnt put a port in ill never know.saving money i guess.
|
|
By seishank65 - 5 Years Ago
|
|
I guess my question is how can I connect a vacuum gauge with my current setup.
|
|
By oldcarmark - 5 Years Ago
|
|
I have done it that way myself. Shouldn't be a Problem.
|
|
By seishank65 - 5 Years Ago
|
|
oldcarmarc do you mean justt to tee off the carb vacuum?
|
|
By oldcarmark - 5 Years Ago
|
|
If its the full Vacuum Port at Idle you can Tee off that or anywhere in the Line from Carb to Distributor..If there's also a Port which is only active when the Throttle Plate is opened U can use that. Just won't show reading at Idle.
|
|
By darrell - 5 Years Ago
|
|
my mistake i was thinking you were hooking up something not just a gauge.
|
|
By miker - 5 Years Ago
|
This is the link to the Edelbrock manual. Down at page 21it shows an diagram. #50 is ported vacuum and 51 is full vacuum. 51 is where I’d hook the vacuum gauge for tuning purposes. Either can be used for the distributor, personal preferences vary.
https://www.edelbrock.com/pub/media/wysiwyg/documents/carb-owners-manual.pdf
|
|
By seishank65 - 5 Years Ago
|
|
Thanks everyone for their input and fast replies
|
|
By seishank65 - 5 Years Ago
|
|
miker I currently have my distributor plumbed into this port (51), for tuning purposes can i just unplug the dizzy vacuum line and plug in my vacuum gauge?
|
|
By miker - 5 Years Ago
|
Short answer is yes, but I’d prefer to use a tee. I like checking and tuning with the vacuum advance in the running position. If you unplug the distributor, you’ll find the loss in advance slows the engine down, and you might have to add to the idle speed.
I’d do a search for ported and non ported vacuum. Lots of folks here, including Ted, IIRC, run the ported vacuum to the distributor. I’d try that, retune for it, and take it from there. Or, if you’ve been down that road, use a tee to put the vacuum gauge in.
|
|
By seishank65 - 5 Years Ago
|
|
Thanks miker I really appreciate your help
|
|
By Ted - 5 Years Ago
|
See if these pictures help.
|
|
By seishank65 - 5 Years Ago
|
|
Thanks Ted a picture says a thousand words.
|
|
By oldcarmark - 5 Years Ago
|
|
Just a Heads Up. If U are not using the old Choke Setup in the Manifold there is a Tube inside the Manifold that connects the Fitting on One Side to a Fitting on the other Side. Those Tubes rust out over the Years and will cause a Vacuum Leak if not Plugged on both Ends. I tapped both Sides and screwed a Bolt in to Plug it. You might want to do that and avoid Vacuum Leaks at some Point if not now.
|