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Old 02-13-2018, 07:33 PM   #21
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Yesterday after the headers arrived, the bolts that came with them were 10mm x 1.25, so I pulled a stud out and checked it and sure enough, they are 1.25's. The info I got from summit racing is that the 1.25's were discontinued in 2011 and all coyotes since have the 1.50's. Well today I went down to summit and bought a set of stage 8 locking header bolts in the 1.25's to fit my car and I informed the counter guy that the info on their site is wrong. When I got home, I also fired off an e-mail to stage 8 to let them know so they can update their database. I also asked if they could produce a set of locking header nuts so we could reuse the factory stainless studs. I got a reply from them, here it is.

Hello Mike,

Updating the 5.0 Coyote exhaust bolt thread pitch has been a long running joke for some time now, for a lot of companies. Ford changed the thread pitch back and forth several times and we were all told the the final thread pitch would be M10-1.50. You can attest that's not the case. Many header companies put two sets of bolts in their headers so they cover both.

We have Locking Nuts, we just don't make a header nut kit for the 5.0 but all you need to do is call and ask for them. We don't offer a nut kit because most people want to use bolts. Studs can still come loose even if they have a Locking Nut, the stud can still unscrew from the head. Using a bolt eliminates that.

Thanks for the suggestions though I'm always keen to hear new ideas.

Glenn Thompson
Stage 8 Locking Fasteners

After reading their reply, it now makes sense why they state on their site that all coyote owners should double check what thread they have before ordering.
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