Carbide inserts for renewing threads? I never heard of such a thing. Do you have a link?

 

Carbide inserts for renewing threads - Bing_

 

1) Time Sert - Bing
2) E-Z LOK Insert - Bing_
3)thread repair repacement inserts - Bing

 

I would love to avoid any complications like broken bolts. I'll be swapping out manifolds for headers soon on my 390. Whats the best way to prep these bolts in an effort not to break them? PBblaster? I realize it may happen anyways. Should I try and remove them with a hot engine rather than cold? It looks like I may have one or two bolts that have been replaced with all thread. Is that an issue that needs addressing or just replace the all thread and nuts? This is my first attempt at headers. When I can I'll get some pics.

 

If you have the heads off,

1. saturate stud or bolt with pb blaster.
2. melt some wax around the stud or bolt.
3. Use heat on the studs/bolt, and weld nut if able. Tap, the welded nut with a hammer lightly. Then work nut back and forth, then remove.

This method works 99% of the time.

Melting the wax is the key...

 

When you get all your bolts/studs out, always replace them with new bolts or studs. I use ARP hardware, and use anti-seize on the new bolts or studs.
I use stage 8 lockers.

World's Best Locking Fastener | Contact Us At Stage 8

 

Thanks for the info maxtor. Ill give that a shot and let ya know how it goes. The previous owner did mention having to tighten the manifolds occasionally. Hopefully that means the bolts or studs moved freely at the time. Ive had it about 3 years. I definitely want to get good hardware and gaskets.

 

If a bolt is broken off flush with the surface, I'd had better luck to find a flat washer that is a fit to the old bolt and weld it to the bolt first. Then I go back and weld a nut to the washer. It puts more heat on the bolt to break it free and give more surface area to weld to so you can put more muscle behind it.

 

I finally got around to starting this project. All the bolts came out easily except 1. Anti seize was used by the P.O.. unfortunately they also forced a larger bolt into the head and left it. It wasn't even in all the way...anyways it broke off and I drilled it out. I'll probably just put a bolt through it with a nut on it.