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post #1 of (permalink) Old 03-10-2001, 03:09 AM
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Exhaust Manifold Plugs

I have an 86 Suburban and I am looking for plugs to close the air pump holes in the exhaust manifolds. I have not had any luck finding them other than an oil drain plug for $4.75 and I need 8 of the things! Where should I be looking? Are they 7/8" 18 count threads or am I missing something?

Thanks!

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post #2 of (permalink) Old 03-10-2001, 12:01 PM
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Re: Exhaust Manifold Plugs

If I remember correctly, they are pipe threads. Go to a regular hardware store and you should have better luck.

Bad Dog

85 K30 CUCV, 350 TBI, TH400, NP205, D60/C14, 4.56
Coming soon: 4" lift, 40" tires, massive cutting, shorter wb and rear overhang.
post #3 of (permalink) Old 03-10-2001, 12:12 PM
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Re: Exhaust Manifold Plugs

Ace hardware!

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post #4 of (permalink) Old 03-10-2001, 05:33 PM
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Re: Exhaust Manifold Plugs

<font face="Comic Sans MS">If you have trouble finding a plug for it, go to the hardware store. If the pipe plugs don't fit, buy a tap that'll work with the pipe plugs, and tap the manifolds to accept them. [img]/wwwthreads_images/icons/crazy.gif[/img] That's what I'd do anyhow. Also, I'd probably put a tiny little tack weld on each of them just to be sure they won't back out very easily... But that's likely not necessary. </font>

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post #5 of (permalink) Old 03-10-2001, 06:03 PM
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Re: Exhaust Manifold Plugs

I tried the hardware store, farm supply, fastener places, farm equipment dealers, welding shops and auto dealers and none could help (other than the oil drain plugs0. This is not pipe thread it is a inverse flare fitting (I know because I had a guy tell me that....). I went to NAPA and they think they can order these for me. I'll let you know if they really can. I won't get them until Wednesday, then I'll have to get the thing back together... I'll write when I get done. I also had a suggestion from a mechanic friend that I weld the nuts closed and reinstall them... We shall see!

Thanks for the suggestions!

post #6 of (permalink) Old 03-10-2001, 06:50 PM
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Re: Exhaust Manifold Plugs

Hmmm, it was not a late model SB but I swear I remember using standard pipe plugs. Oh well, good luck.

Bad Dog

85 K30 CUCV, 350 TBI, TH400, NP205, D60/C14, 4.56
Coming soon: 4" lift, 40" tires, massive cutting, shorter wb and rear overhang.
post #7 of (permalink) Old 03-10-2001, 08:25 PM
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Re: Exhaust Manifold Plugs

Dude, I have manifolds for 1979 305, if you think they would fit they are yours. You will need to only send a check for the postage on the box when you get it. Let me know, my profile has email link but I prefer private message because my antivirus software locks up my email now and then. I have pics of manifolds and will measure them. Frank

post #8 of (permalink) Old 03-10-2001, 11:32 PM
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Re: Exhaust Manifold Plugs

If you have the tubes that came out of it have someone weld the end shut and install just the end thats what I do.

88 (SPORT)1500 4X4 6in. SUPERLIFT, 35X12.50 BFG AT

post #9 of (permalink) Old 03-10-2001, 11:35 PM
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Re: Exhaust Manifold Plugs

Yeah, that makes more sense that wasting allot of time looking for plugs.

Bad Dog

85 K30 CUCV, 350 TBI, TH400, NP205, D60/C14, 4.56
Coming soon: 4" lift, 40" tires, massive cutting, shorter wb and rear overhang.
post #10 of (permalink) Old 03-14-2001, 01:06 PM
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Re: Exhaust Manifold Plugs

I found that the oil drain plugs I first found are the only solution without retapping the manifold or welding the caps shut (both good ideas).

I took the drain plugs and put lock washers under them and sealed the threads with exhaust patch and it seems fine!!!

In case you or someone else is looking for the plugs (a couple of my caps were trashed in removal...) They are Motormite Part #65231 7/8" - 18 Standard oil drain plugs.

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