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351 Cleveland exhaust manifold bolt
#1
Hello everyone this is 1st time I have been on here and posted something. I hope to find this very useful and helpful for me. I have a 71 Mustang Mach 1 with 351 Cleveland, last weekend I went to replace a exhaust manifold gasket with thought it would be a easy fix but turned into a 2.5 hour project(hard to get wrenches in right spot). My problem is one of my exhaust manifold bolts are stripped into the head? I am thinking this is why the exhaust manifold gasket blew out in 1st place. Any suggestions on how to fix? Longer bolt maybe work? Thanks for any help!

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#2
The normal way to fix stripped threads is to drill and tap for a heli-coil. Probably tough to do with the head on the car, depending on which one stripped. You may want to remove the head and take it to a machine shop to install, to make sure it's done correctly.

Steve
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#3
A longer bolt is certainly worth a try. Chase the threads to the bottom with a thread restorer NOT a tap. Then try the longer bolt. There is not supposed to be a gasket between the head and exhaust manifold. If you want to make sure it seals use a THIN coat of RTV, tighten the bolts and let it cure for 24 hours. It won't burn out and it will seal. Chuck
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#4
c9zx;188366 Wrote:A longer bolt is certainly worth a try. Chase the threads to the bottom with a thread restorer NOT a tap. Then try the longer bolt. There is not supposed to be a gasket between the head and exhaust manifold. If you want to make sure it seals use a THIN coat of RTV, tighten the bolts and let it cure for 24 hours. It won't burn out and it will seal. Chuck

+1 on the thread chaser. I found that a lot of the times the first couple threads are jacked. You clean them up and the bolt will grab nicely onto the remaining threads. Make sure not to bottom out the boltExclamation This is what usually ruins the threads when you try and take out that bottomed out bolt.
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#5
Welcome to the forum!

'Mike'
73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

Pics of modifications included in:
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#6
If it were me, I pull the head and work on it on the bench or take it to a pro if I couldn't get it.

Post a short intro in the Introductions section when you get a chance, so we can give you a proper welcome. welcome

Doc

[Image: 6y14ea.jpg]

Project started 8-7-10
Completed: All new suspension, rebuilt 351C H Code bored .030 over with mild cam and intake, new 3.50 TracLok, custom exhaust system
Current "mini-project": interior upgrade Undecided
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#7
I appreciate all the advice the longer bolt did workSmile then when I went to start it. It still has a exhaust manifold leaks double checked all the bolts and they are tight. Anyone else confirm that u for sure don't need exhaust manifold gaskets on these? I have heard of such a thing. Thanks again for all the help!


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#8
You can install gaskets. Make sure the manifold is not cracked and that the mating surface is clean not pitted. Installing gaskets will help seal the minor imperfections. Also make sure the bolts are not to long.
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#9
Maybe this will help.


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#10
My understanding has always been that the facrtory didn't install gaskets because of the (supposed) pefect mating surfaces. After that, though, you install gaskets. They are available. $11.69 here at NAPA.
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