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in the process of changing a valve cover gasket, i noticied another leak from the intake itself. I will try to attach a picture of the port.
what is this used for? i have finally found a decent picture and there is a bolt partially installed.
leakage apparently blow out from port
[img alt="Screw
in port for locating problem"]https://cimg7.ibsrv.net/gimg/www.ford-trucks.com-vbulletin/2000x1504/pxl_20260122_172254242_fc07e3103a2ddfe57c7b107759c de77b988c5022.jpg[/img] Screw in port for locating problem
[QUOTE=bmoran4;21751158]If I have my mental orientation correct, I believe that is a choke tube port[/QUOTE
Found it on Thunderbird site after your input. It is a Thunderbird engine so you were correct
Thank you
When I have an intake off I block the passage with thin stainless steel sheet metal.
if you notice, a lot of y blocks the paint burns off the intake in this area. It's supposed to warm up the intake/carb but we drive these when it's mostly warm out and really not needed
As the tube further disintegrates, more exhaust gases will be expelled and you will start hearing exhaust noise (and most likely fumes in the cab).
What is the other side of the tube connected to again?
- EDIT -
Do you see the CASTING ID NO. on the intake itself? You use the port on the right side of the engine for what purpose?
The port on the right side intake has not been hooked up is a very long time. Actually not sure when there was a tube coming out of it. So it has likely been open since 1981 when we rebuilt the engine. Not sure before then. If this is only exhaust, can i thread and install a pipe plug without removing intake??
... can i thread and install a pipe plug without removing intake??
That will be the easiest and quickest way out if the hole is accessible for a drill (w/o removing the intake).
The cleanest way would be the blocked-off intake manifold gaskets.
The ones shown above only restrict cross-flow, not totally eliminates it. You would have to fashion block-off plates (coke can) to totally cover the gasket crossover passages. There used to be available gaskets that would totally block-off the cross-over for HP engines.
Still curious as to the manifold CASTING ID and is there a choke ****/cable on the truck?
Or better yet, do you remember the engine having a hot air choke at some point?
Last edited by KULTULZ; Jan 24, 2026 at 09:01 AM.
Reason: THE USUAL - CRS
That will be the easiest and quickest way out if the hole is accessible for a drill (w/o removing the intake).
The cleanest way would be the blocked-off intake manifold gaskets.
The ones shown above only restrict cross-flow, not totally eliminates it. You would have to fashion block-off plates (coke can) to totally cover the gasket crossover passages. There used to be available gaskets that would totally block-off the cross-over for HP engines.
Still curious as to the manifold CASTING ID and is there a choke ****/cable on the truck?
Or better yet, do you remember the engine having a hot air choke at some point?
yes I make my own total block off plates when I install
I think the heated crossover manifold also contributes to vapor lock and gas boiling in the carburetor. Our modern gas boils at a lower temperature than the gas from 40+ years ago. Modern fuel injected engines run higher fuel line pressure, so are not as prone to vapor lock. Plugging that little hole probably could be done with JB weld epoxy, to stop the mess, but the crossover heating will continue and may give you grief on a warm summer day. 🥵
Use masking tape to hold the epoxy in the hole. After it cures the pull the tape off.
You could also use that exhaust leak sealing putty, that is heat cured by the exhaust heat.
Last edited by Truckfarm; Jan 25, 2026 at 08:43 AM.
Thanks to all that responded to my issue. I feel better that i do NOT have to take the manifold to correct this issue. I do have a manual choke on it. Here in northeast north carolina, really cold is not common as in southern illinois where we did live.
I am not sure of the intake manifold part numbet yet. I took pictures of the number on front top behing thermostat housing. It is actually the firing order of the engine.
Thanks to all that responded to my issue. I feel better that i do NOT have to take the manifold to correct this issue. I do have a manual choke on it. Here in northeast north carolina, really cold is not common as in southern illinois where we did live.
I am not sure of the intake manifold part numbet yet. I took pictures of the number on front top behing thermostat housing. It is actually the firing order of the engine.
the y block intake is probably the easiest intake to change of all v-8 intakes. You don't have to pull the distributor
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