header bolts loosening

[PlayingWithTBI]

I don't like the thread engagement on those nuts. I'd like to see at least one full exposed thread on the stud, but if it works, who am I to complain?

We considered leaving the studs out a little further but decided to bottom them out so it would help to keep them from backing out. Those nuts are deeper than normal nuts due to the locking flanges so there was enough threads IMO. Keep in mind those are grade 8 nuts and studs.

 

[Donald Mitchell]

https://www.summitracing.com/parts/stg-8911
https://www.amazon.com/Spectre-Perf...words=sbc+header+bolts&qid=1622303284&sr=8-14

 

[Frank Enstein]

Left rear of a Ford would be #8. #4 would be right rear.

I guess it depends on where you are standing!

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[PlayingWithTBI]

I guess it depends on where you are standing!

Not really - left and right is determined by sitting in the driver's seat looking through the windshield. Front is towards the radiator and back is towards the rear bumper - always been that way in my lifetime

 

[jaywestfall]

I wound up buying these Stage 8 ones. Not cheap, but it seemed to be the best solution for header bolts loosening.

Has anyone on here tried them, comments?

https://www.stage8.com/product/8951-small-block-chevrolet-header-bolt-kit-stainless-steel/

 

[PlayingWithTBI]

Has anyone on here tried them, comments?

https://www.stage8.com/product/8951-small-block-chevrolet-header-bolt-kit-stainless-steel/

I looked at those too before I went with the studs. The only thing I saw was some folks said they didn't fit in some spots. I figured if I had a problem with the nuts not fitting on my studs I could always go with smaller Stover nuts to make it work.

 

[CrustyJunker]

I wound up buying these Stage 8 ones. Not cheap, but it seemed to be the best solution for header bolts loosening.

Has anyone on here tried them, comments?

https://www.stage8.com/product/8951-small-block-chevrolet-header-bolt-kit-stainless-steel/

Sorry to say no personal experience on my small blocks, but heard good things. They should work great!

 

[Schurkey]

I guess it depends on where you are standing!

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Your illustration proves my point. LR is #8, RR is #4.

 

[alpinecrick]

I wound up buying these Stage 8 ones. Not cheap, but it seemed to be the best solution for header bolts loosening.

Has anyone on here tried them, comments?

https://www.stage8.com/product/8951-small-block-chevrolet-header-bolt-kit-stainless-steel/

They look like a good idea. I would not use the pieces that use the header tube as a “stop” because I suspect it will eventually wear into the tube wall. The pieces that hook over the flange appear to be quit feasible.

 

[Queso Del Rio]

Safety wire was pulled too tight. It's one of those sciences that looks like an art until you learn the tricks. Also, I'd probably go with .041" wire

I don't like the thread engagement on those nuts. I'd like to see at least one full exposed thread on the stud, but if it works, who am I to complain?

Definitely an art to it. I worked supersonic military jets for years with engines moving at 16K+ RPM. Proper wire is crucial. A mix of Nickel, Chrome and Aluminum (Ni-Cr-Al) will handle the harshest applications. Some of the "FAA-approved" stuff is plain ****! Erik the Awful is spot-on too with the lack of thread protrusion! Hard to mitigate this though without changing studs. Thinner profile nuts would lessen the grip surface on the studs too.

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