Exhaust manifold thread size??

[Turk Carmichael]

Okay guys I am tired of looking. I have been to the store twice and they sold me the wrong size nut twice! Does anyone know what thread size is on the stock exhaust manifold where the H-pipe connects to it? One of my nuts actually fell off!!

And I did take one of the nuts off and it went right on a 3/8-16 bolt. So I bought a 3/8-16 nut and of course it didn't fit!!?? I figured it was metric but the one I took off didn't fit a metric bolt.

 

[Turk Carmichael]

Well I guess I will try a M10x1.5 next

 

[mikeysgt]

Are you using regular nuts from autozone or home depot store? I didn't have mine after I took my longtubes off. Didn't feel safe running regular nuts so I bought the oem locking ones from ford. Not too expensive since its only four of them. They have a slight oval shape to them so they won't back out

 

[BruceH]

Just measured one. It's M8x1.25

 

[Turk Carmichael]

Are you using regular nuts from autozone or home depot store? I didn't have mine after I took my longtubes off. Didn't feel safe running regular nuts so I bought the oem locking ones from ford. Not too expensive since its only four of them. They have a slight oval shape to them so they won't back out

As far as I know it was a stock one that backed out. I figured the things would rust on and never come out! lol.

 

[Turk Carmichael]

Just measured one. It's M8x1.25

Great! Thanks!

 

[Turk Carmichael]

Well now I am even more befuddled. The inner diameter of the nut I took off of the car was .34. I just checked the "ID" of the m8x1.25 and it is .265. I have an m10x 1.25 and it measures .345. It must be a m10x1.5. I will get all 3 and check them on the car after work, and then search for a hard one.

 

[BruceH]

I measured an exhaust manifold stud. Sorry.

 

[mikeysgt]

why not just go to ford and get the oem ones instead of running around looking for some?

 

[Turk Carmichael]

why not just go to ford and get the oem ones instead of running around looking for some?

When it started I didn't think it was gonna be this big of an issue. It is just a flange nut for crying out loud. I figured they would be abundant but apparently not.....

 

[mikeysgt]

yeah i went to autozone and they didn't have any, and then to another auto parts store and still nothing. didn't want to drive around all over town so just drove to ford and was done with it

 

[Turk Carmichael]

Okay, thanks for the help guys. I finally figured it out and it is m10x1.5
Maybe this will help someone in the future anyway.