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Weird holes inside 440 intake?? #2791029
06/30/20 02:54 PM
06/30/20 02:54 PM
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Montana
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62_Sport_Fury Offline OP
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On my stock 1971 (1972) 440 intake I just acquired, I noticed 2 strange holes inside that appear to be non-stock. See photos, it looks like someone drilled out the factory cast round button, and put some sort of nut on it. There’s a hole that goes down, but it doesn’t go to heat crossover passage, I blew air through both and they are independent. The bottom outside of the manifold is untouched, there are no welds or other holes anywhere. EGR didn’t start until 1973.

Any ideas what these could be, leftovers from some sort of aftermarket sensor?

Wade

F9CD177D-33B7-497A-B3B4-5CECCE0EEC85.jpegCDA9A936-88F5-426C-8FE7-7642BB63EE12.jpeg
Re: Weird holes inside 440 intake?? [Re: 62_Sport_Fury] #2791031
06/30/20 03:01 PM
06/30/20 03:01 PM
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Nebraska
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4406bbl Offline
top fuel
4406bbl  Offline
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Nebraska
Egr ports, pollution control

Re: Weird holes inside 440 intake?? [Re: 62_Sport_Fury] #2791033
06/30/20 03:03 PM
06/30/20 03:03 PM
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northern,Ohio,USA
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Clanton Offline
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So it is a blind hole in the nut?No through passage


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Re: Weird holes inside 440 intake?? [Re: 62_Sport_Fury] #2791039
06/30/20 03:10 PM
06/30/20 03:10 PM
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Montana
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62_Sport_Fury Offline OP
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UPDATE: after some more cleaning, I uncovered a tiny little hole at the bottom of these two vertical cylinders. They are indeed connected to the exhaust heat crossover, I can feel the air when I blow it through. So there must have been some sort of sensor in the upper and lower manifold passages that measured the Air temperature in the heat crossovers? Did Chrysler do this, or was this a common practice by hobbyists?

Re: Weird holes inside 440 intake?? [Re: 62_Sport_Fury] #2791044
06/30/20 03:26 PM
06/30/20 03:26 PM
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Grand Prairie,Texas
stumpy Offline
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no way would there be a sensor there because you would have no way to attach to any kind a gauge or reader. Also from the carbon build up you can tell there was nothing in those holes.

Last edited by stumpy; 06/30/20 03:30 PM.
Re: Weird holes inside 440 intake?? [Re: 62_Sport_Fury] #2791047
06/30/20 03:31 PM
06/30/20 03:31 PM
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S.E. Michigan
ZIPPY Offline
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Those little widgets are called EGR Jets.
They are a factory installed, old time emissions item.
Chrysler did it.

Yours were plugged with carbon which is a common issue with basically anything associated with the heat crossover on most anything.

Not many folks know or care about things like that anymore, but if you take apart a bunch of old smog era motors
you will encounter them in the future.




Rich H.

Esse Quam Videri




Re: Weird holes inside 440 intake?? [Re: ZIPPY] #2791056
06/30/20 03:57 PM
06/30/20 03:57 PM
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Rio Linda, CA
John_Kunkel Offline
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Technical name is "floor jets".


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Re: Weird holes inside 440 intake?? [Re: ZIPPY] #2791095
06/30/20 06:00 PM
06/30/20 06:00 PM
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Oregon
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AndyF Offline
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One of those emissions things that lasted for a few thousand miles before becoming plugged up. Just another one of the bad ideas from the 70's.

Re: Weird holes inside 440 intake?? [Re: 62_Sport_Fury] #2791195
06/30/20 08:25 PM
06/30/20 08:25 PM
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Keizer, Oregon U.S.A.
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elmor353 Offline
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Pull them out and put plugs in there.

Re: Weird holes inside 440 intake?? [Re: elmor353] #2791295
06/30/20 11:38 PM
06/30/20 11:38 PM
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Posts: 30,247
Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
dIc dOc Deity !  Offline
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Florida STAYcation
Broom THIS intake out and get at least a street performance aluminum intake

Re: Weird holes inside 440 intake?? [Re: dIc dOc Deity !] #2791302
06/30/20 11:51 PM
06/30/20 11:51 PM
Joined: Jun 2020
Posts: 8
Montana
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62_Sport_Fury Offline OP
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Thanks for the inputs on these EGR jets / floor jets. What threw me is that I didn't think EGR stuff appeared on 440's until 1973 - I got that info from the 440 Source website, which has a great page that shows pictures of all the 440 manifolds ever made, by casting date, and a short description. Here's the link: http://www.440source.com/intakes.htm

At any rate, I was able to remove them fairly easily, and I cleaned them up - I've attached a photo for those who have never seen these before, they're new to me.

I'm not sure what size plug these are (?), they seem to have some very coarse threads. I'll probably just put some JB Weld into their little holes and stick them back in. Since I'm going to block the heat crossovers with a valley pan, their shouldn't be much risk of a vacuum leak with these little buggers (but holler if that's a bad assumption).

IMG_2435.JPG
Re: Weird holes inside 440 intake?? [Re: 62_Sport_Fury] #2791381
07/01/20 09:31 AM
07/01/20 09:31 AM
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Posts: 17,800
S.E. Michigan
ZIPPY Offline
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ZIPPY  Offline
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'72s are cool, but can be weird with things like that.
Just my opinion but it always seemed a transitional year.

You don't have to bother plugging those holes with anything at all if you're going to block the crossover with a felpro 1215 or similar.
Just get it really clean, either re install the jets or toss them, use the 1215 gasket and run it.

The aftermarket holley street dominator, torker, weiand 7512 and so on all have open egr holes in the bottom, have all been
run mostly open for decades that way and it just doesn't seem to affect anything.

If you feel strongly you have to plug it, rather than jb weld I would suggest drill and tap for common NPT
rather than search for whatever oddball threads the plugs are.

Of course an even easier way out is a '71 intake casting 3512501 or an aftermarket aluminum/stock replacement style.

Good luck.



Rich H.

Esse Quam Videri










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