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New Exhaust Manifold has A.I.R. ports
#767669 November 20th 2020 1:51 am
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My 1977 B100 has a broken exhaust manifold from PO. No biggie I thought. Found new one at auto parts store. Took old one off (after cussing the exhaust flange bolts) and went to put new one only to realize the new one has AIR channel through it. i.e. a channel w/ an threaded open end on each end of the manifold which also ports to just right about the openings in the manifold. My existing manfold had dimples in the cast iron where those ports should be but was still solid.

I've scoured the internet for hours trying to find my exact exhaust manifold w/o those AIR ports but can't find anything new. Question is can I screw in a plug on either end & cap it off & still use it? Or is it just going to blow coolant everyhwere? [img]https://lh3.googleusercontent.com/D...p_b-4uIuVY7wcirw=w670-h893-no?authuser=0[/img][img]https://lh3.googleusercontent.com/E...riYG0PTQvYFcG39g=w670-h893-no?authuser=0[/img]

https://lh3.googleusercontent.com/U...3FL07gwItKnBl5A=w1190-h893-no?authuser=0

Last edited by CowboyVan; November 20th 2020 1:53 am.

1977 Dodge B100 318 POS
Re: New Exhaust Manifold has A.I.R. ports
CowboyVan #767687 November 20th 2020 9:58 am
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Yes..you can plug them off and use manifold gaskets without the A.I.R. provisions.

Last edited by NateB; November 20th 2020 9:58 am.

Nate Breece
--------------
1993 Chevy G20
2012 Hyundai Santa Fe
1 member likes this: CowboyVan
Re: New Exhaust Manifold has A.I.R. ports
CowboyVan #767715 November 21st 2020 9:53 am
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Drill, tap and plug them. Easy to do. It works both ways, air manifolds on non-air head and air heads on non-air manifolds.

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Re: New Exhaust Manifold has A.I.R. ports
CowboyVan #768157 December 02nd 2020 4:57 pm
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Thanks. I plugged them with brass fittings from Lowes. They actually don't do anything on mine, I thought they'd blow out air but they didn't. Still plugged them bc I didn't think water / debris needed to get in them. There was a small 5/16" bolt hole though that definitely shot hot air out of it. I plugged that though & all is good. I still used the gaskets that came with it as I couldn't track down the gasket that didn't have holes in it. Seems to be fine though.


1977 Dodge B100 318 POS

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