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Old 02-13-2018, 06:33 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.


Regards,
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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Old 02-21-2018, 01:18 PM   #22
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Finally got them installed, did not use the lock clips. I could barely get my big bear paw hands in there to just get the bolts in. Half of them I had to install by feel because i couldn't see them so there was no way I could put on the clips.
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Old 02-21-2018, 08:34 PM   #23
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While I was installing my headers, I found the vin stamp on the engine. It's located on the drivers side rear right above the pan rail on a machined pad. It has the last 8 characters from the vin stamped into it. Good info to know if your looking at a used S-550 and want to know if it still has the original engine, or if you need to prove originality before a sale or auction.
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Old 02-22-2018, 08:23 AM   #24
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That is awesome. So did everything line up well? Sometimes headers don't exactly fit as well as you'd like.
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Old 02-22-2018, 08:45 AM   #25
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Yeah, it lined up well, but it was tight. Going from a smaller primary tube to a large 1 7/8ths primary made it rather difficult. Some of the bolts I had to install by feel because I couldn't see the bolt holes at all. The advantage is that if I had a problem, stainless works is actually closer to me than summit racing. I chose them because they are local.

Yesterday I bought a few smaller items, a pre painted gas door that has the running horse logo embossed in it.



I also bought a set of hood struts to eliminate the prop rod, and I bought a washable air filter designed to fit my ford racing power pack setup.
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