Manifold-to-Cat stud stripped

[MSGia]

Good morning all, I’m in the process of swapping both cats on my truck (4.0 SOHC), they both threw codes and now that I have them out it’s just dust in there, no catalyst left. But my question is about the hardware. Out of the 4 bolts connecting the header flange to the inlet of the cats, only one came off still intact so I went to buy more and took the bolt with. I measured the original bolt on the tool they had there l it read 3/8-16, but after a few trips back and forth it seems like no size works. The threads on the header-to-cat studs look fine (at least to me, not too certain ), so what should I do moving forward?

 

[Snoranger]

That’s probably M10x1.5 like most other new Fords.

 

[MSGia]

That’s probably M10x1.5 like most other new Fords.

Thanks, I’ll try it out. Odd because the old nut threads perfectly onto 3/8-16. I have tried 3/8-24 and M10x1.25 so far.

 

[sgtsandman]

You can check out Rock Auto, if you can afford to wait. Last I checked, they had exhaust to cat studs available for my 2011.

 

[MSGia]

That’s probably M10x1.5 like most other new Fords.

Thanks. M10x1.5 works, but two out of the four won’t start threading by hand, just spinning. Any suggestions?

 

[Snoranger]

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[Roert42]

Cut them off, drill them out, and replace it with a stainless steel bolt/nut/washers.