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As mine sits right now l have the brake booster routed to the vacuum tree and the PCV routed to the OEM fitting on what used to be the EGR housing (now, extensively modified, it's just a spacer and a vacuum port).
if your carb is like mine, the internal passage for the fitting up in front (arrow, under the filter) goes up into the carb body above the throttle plates, for ported vacuum. @FuzzFace2 , that's the one that gave me fits a few wks ago on my new carb... it was later confirmed to be a blind hole w a fitting stuck in it. Unbelievable.
I just looked at mine and it is the same:
Brake booster to the vacuum tree
PCV to the EGR plate that is used for the PCV only as Idont have the EGR working.
Dave ----
So I have two other large ports on the carb. The one circled and a second behind the fuel/carb filter near where the arrow points to. Can I use one of those?
My carb is a little different than yours so here goes it.
I am going to guess that front one down low would be for the dist. vacuum advance.
Easy to check, with motor up to temp and at idle see if there is vacuum on it, should not at idle.
Now raise the idle speed and see if there is vacuum on it, there should be if it is ported vacuum.
That upper capped fitting is for the choke fresh cool air inlet.
It looks like you have a after market carb and it uses a full 12 volts to the choke.
Factory choke was hot air asst. It used hot air & 6 volts to make it open.
The 6 volts came from the "S" lug on the ALT.
Hot air came from the EXH manifold.
A hose & metal line was connected to that upper carb fitting and ran down to the exh manifold.
A tube passed thru the manifold to pick up heat from the exh, this heated the air from the upper carb fitting.
Then a metal line went from the exh manifold up to the choke housing.
See that rusted plug just to the left of the circle in the choke housing to heat the choke.
Dave ----
@FuzzFace2 I believe I still have the old egr plate. Is it worth it to reinstall even though it doesn't work anymore?
If it has the fitting for the PCV it maybe best to install it.
I say this only because if you have the brake booster and the PCV vacuum feeding off the same fitting I dont know what may happen to the booster vacuum?
It could be the PCV would be pulling too much vacuum and the booster not have enough vacuum to work right.
Just the way I see it at this time.
BTW here is my set up before I installed the factory air filter. I also dont have vacuum to the dist. for advance hooked up yet. You can just make out a hose with a screw in it down at the base of the carb.
With the air filter installed I cant get a good picture and it is a pain to remove the filter.
Dave ----
@FuzzFace2 so if that front port is vacuumed, I should be able to put the PCV hose to it?
The one onthe EGR plate or the small one at the front of the carb in my picture?
In the EGR plate yes PCV hose can hook to it.
That is where mine is and think Rembant / Cory said his went too.
I am shocked that with the EGR plate removed the throttle linkage dose not hit the valve cover?
Thought other had that issue if the plate was removed?
If you use thick gaskets above and below the EGR plate it should help keep the carb cooler so less issues with hot restart.
Dave ----
@FuzzFace2 sorry the front carb one. If it's vacuumed I can use it for PCV hose? If not I'll just put the EGR port back on. What did you all do with the wires that come off the EGR port?
@FuzzFace2 sorry the front carb one. If it's vacuumed I can use it for PCV hose? If not I'll just put the EGR port back on. What did you all do with the wires that come off the EGR port?
What size is the nipple and will the PCV hose fit it?
If it is large enough for the PCV hose to fit dose it have vacuum all the time when running?
In my picture the hose is at the bottom front corner facing us just above the EGR plate.
It is small so the PCV hose would not fit it.
As for the EGR it should have only 1 small hose going to it.
In my case nothing was hooked to it when I got the truck so I did not try to get it working again.
Any other vacuum lines were not hooked up to anything so I removed them off the motor.
I only have a few vacuum hoses on my motor.
Brake Booster to vacuum tree on manifold
PCV to port on EGR plate
Dist. Advance to ported vacuum on carb
HVAC (ac & heat) to vacuum tree on manifold
Evap canisters to vacuum tree on manifold (this one you dont have to have hooked up)
Dave ----
@Jonnyuma so are you saying the port I was planning on using doesn't provide vacuum and will not work?
No. That was just something l was working through a few weeks back involving an improperly machined carburetor. I decided not to use it and rebuilt a junkyard carb that l had on the shelf instead.
... In the EGR plate yes PCV hose can hook to it.
That is where mine is and think Rembant / Cory said his went too.
I am shocked that with the EGR plate removed the throttle linkage dose not hit the valve cover?
Thought other had that issue if the plate was removed?
-
l couldn't get the throttle connected without some kind of spacer. I cut down the original EGR, filled the giant hole with epoxy and left the vacuum port for PCV. Whats left is the black thing under the carb;
This leaves a hole in the intake manifold that connects to the exhaust (putting the EG in EGR) that needs to be plugged, filled, or capped to seal up the exhaust manifold. The correct way would be to tap it for a grub screw or pipe plug... l didn't do that.
I used a small freeze plug with a little sealer on it that drove in the hole.
I did this because i run hot water to the intake to heat it like the exhaust did and was afraid water would be there.
I still have the EGR valvein place too.
Dave ----
@FuzzFace2 sorry the front carb one. If it's vacuumed I can use it for PCV hose? If not I'll just put the EGR port back on. What did you all do with the wires that come off the EGR port?
If the front port is like they said and is for the distributor, don't worry about it, your PCV hose will not fit, the PCV hose is way bigger than a dist vacuum port nipple. If this front port you are talking about is as large as the PCV hose, then it still has possibilities.
Update, so the front port I was thinking about was hooked to the distributor like you all mentioned. I looked at the small port on the side of the carb and it has vacuum when the engine is revving. My PCV Valve has a double port so I plugged the larger and hooked a hose from the smaller port to the smaller opening on the side of the carb. This should be sufficient correct?
Ok question
The port the hose goes to the dist. dose this have vacuum at idle normal temp of motor?
How about if you raise the motor speed to 2500 RPM?
The small port you have the PCV to on the carb.
Does it have vacuum at idle normal temp of motor?
How about if you raise the motor speed to 2500 RPM?
The last thing I dont thing that small port on the PCV and hose is enough to pull the condensate from the motor.
That is why the factory uses the large port on the PCV.
I would install a tee in the intake where the booster is hooked to and use the large port on the PCV.
Dave ----
Update, so the front port I was thinking about was hooked to the distributor like you all mentioned. I looked at the small port on the side of the carb and it has vacuum when the engine is revving. My PCV Valve has a double port so I plugged the larger and hooked a hose from the smaller port to the smaller opening on the side of the carb. This should be sufficient correct?
No, you need to use the large hose or the PCV is not going to work correctly.
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