2 very quick questions (pics inside)

[78Suburban]

I would REALLY REALLY appreciate any help with these questions.
What is this thingey in front of the egr valve?

What is this vaccume port on the very top back of my electric choke carb?

do I need to find a way to plug both of them? if so, what is the best way?
Thanks to all the ck5ers that have helped me with this motor swap. I'm almost done with it now. Before I found ck5, I was barely confident at changing spark plugs
THANKS SO MUCH,
James

 

[dremu]

I think that's only one question. IIRC, that thingy is a heat riser or some kind of thermal valve, and I seem to recall it having a bent hardline going to the back of the carb, i.e. that open port you pic'd.

If no-one else posts up, lemme know and I'll go tear off an aircleaner and get a pic for you.

-- A

 

[Cricket]

I'd agree the first pic is a heast riser tube - now missing. On my 77 it ran up to the q-jet choke dashpot.

2nd should go to your aircleaner base.

 

[78Suburban]

i'm so lost.....

so what does the heat riser thing do? is it something to do with the choke, or emmissions, or what? could I just block both off and call it good?
thanks,
James

 

[Muddytazz]

The heat riser tube was for the older style stove pipe chokes (non-electric) you can just plug the hole.

The second pic i'm in agreance with, base of air cleaner

 

[beater_k20]

it warms the choke coil. with an electric choke, you no longer need it. it is actually a tube that is looped inside the intake manifold and cylinder head. shouldnt hurt anything like it is, unless it rusts out.

 

[78Suburban]

so am I understanding this right, just plug the port on the back of the carb, and plug the heat riser thing on the manifold? should I just take the heat riser plate off the manifold and make a sold plate to replace it?
thanks,
James

 

[dave_90_blazer]

so am I understanding this right, just plug the port on the back of the carb, and plug the heat riser thing on the manifold? should I just take the heat riser plate off the manifold and make a sold plate to replace it?
thanks,
James

I always do, but i recommend not doing it unless you are pulling the intake, there will be lots of carbon built up inside, and it will be very hard to pull the tube/plate out

 

[79k20350]

just go get some rubber nipples tocover the prts. i got mine at autozone. a whole pack like 5 ea of 7 or 8 sizes for 5 bucks. its nice to have a few differant ones when you need em.

 

[78Suburban]

I'm gonna plug the port on the back of the carb and on the left of the heat riser plate, both with rubber caps. But what about the hole on the right side of the heat riser plate? does it need plugging? how should I plug it if so?
thanks,
James

 

[y5mgisi]

hy man looks like your comin along well. anyway you probly dont even need to do anything at all with the two holes on the manifod it self. Is acually one tube that goes into the manifold about 4 inches than circles back and comes out at te other hole. basicly just a " U " so theres no vacume or anything like that going to it, nothing will happen if anything gets in, and nothing will come out. as for the port on the back of the carb, as the others said run a vac. line from it to the air cleaner base.

 

[dave_90_blazer]

I'm gonna plug the port on the back of the carb and on the left of the heat riser plate, both with rubber caps. But what about the hole on the right side of the heat riser plate? does it need plugging? how should I plug it if so?
thanks,
James

no, doesn't need to be plugged, it is just a loop of tubing that is inside the exhaust crossover

 

[bigbadchev84]

i bet it would melt a rubber cap if you put it on there, they get a little warm

 

[76zimmer]

Pull the choke coil plate off the manifold, cut the tubing off, then make a hi temp gasket to go under the plate, and use hi temp form-a-gasket to seal it up. The back of the carb vac port can be plugged with a cap.
Do you have power to your choke coil on the carb?