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Engine - General, Exhaust & Induction Topics about the general engine items, exhaust system discussed here & Improving the intake tract - air filter to intake valve.

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Old 01-18-2013, 01:45 PM   #1
Exhaust manifold stud size??  
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Hey guys I have a 1987 Shelby Charger with the T1 2.2

I had an exhaust mainfold stud fall out and its pouring water all over the ground....It's the one thats closest to the drivers side....on the bottom of the manifold...Not like thats relevent...

The trouble is that I cant seem to find a bolt to fit it....I've read on the forums that its an M8-1.25 but thats not even close....it doesnt even touch the walls....just slides right on in...The bolt I found was an M8-1.25X20MM

Please guys any help would be great this is my daily driver....
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Old 01-18-2013, 02:13 PM   #2
Re: Exhaust manifold stud size??  
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it is supposed to be an m8x1.25, the next size up would be a 5/16 or an m10 but thats weird
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Old 01-18-2013, 02:38 PM   #3
Re: Exhaust manifold stud size??  
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LOL that figures....I live in an apartment complex so I have no bolt buckets...I guess I'll have to go to the parts store with a friend of mine and buy an M10....Am I right in assuming that the "1.25" is the thread size?
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Old 01-18-2013, 07:02 PM   #4
Re: Exhaust manifold stud size??  
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Im no expert but water shouldnt b coming out of exhaust stud hole. U sure sum1 didnt drill the old stud out n hit a water vane n the head. I just had 2 drill 1 out of my t1 head... Very carefully
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Old 01-18-2013, 07:05 PM   #5
Re: Exhaust manifold stud size??  
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A 1.25 is ur typical corse thread size. A fine thread is 1.0
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Old 01-18-2013, 07:20 PM   #6
Re: Exhaust manifold stud size??  
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The casting behind the studs is very thin. Some went all the way through on machining, some didn't. Copper RTV works wonders to keep them sealed when putting them in. You might of pulled out all the threads. If so the exhaust manifold needs to come off and you need to put an M8x1.25 heli-coil in.
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Old 01-18-2013, 09:05 PM   #7
Re: Exhaust manifold stud size??  
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Head will have to come off to fix this.

I'd hate to be in your shoes.
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Old 01-22-2013, 04:07 PM   #8
Re: Exhaust manifold stud size??  
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Thanks for the help guys but as it turns out the 20mm bolt was simply to short...A friend of mine had an M8-1.25x30mm and it went right in....aparently the holes on the mainifold are a bit larger....

Now for the next question....I'm reading all over the place that the lower 4 exhaust manifold studs will leak coolant if not sealed properly....so if they DON'T go into the water jackets why would these guys need to seal the bolts to stop the leaking?
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Old 01-22-2013, 07:16 PM   #9
Re: Exhaust manifold stud size??  
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read post #6
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Old 01-22-2013, 09:34 PM   #10
Re: Exhaust manifold stud size??  
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mine leaks out of the second one from the drivers side if I don't use RTV/locktite
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Old 01-22-2013, 10:04 PM   #11
Re: Exhaust manifold stud size??  
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on all my heads the lower studs are going to coolant jackets, I use pipe tread sealer and never had any problems
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Old 02-06-2013, 07:26 PM   #12
Re: Exhaust manifold stud size??  
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Thanks for clearing it up fellahs,, but my question was more sarcasm than not...lol...
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Old 02-06-2013, 09:39 PM   #13
Re: Exhaust manifold stud size??  
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I also read that it would be nice to change the exhaust studs to allen wrench bolts but don't know what size for swirl heads.
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