It's common to have to snug up the bolts the first several times the headers are heat cycled. My Thorleys came with some star washers - thought that was a bit odd. Time will tell if they hold up. IMHO, anti-sieze with a mechanical locker (washers or specialized locking hardware) is better. Steel and aluminum are fickle enough - I'd be afraid to use loc-tite.
Check the depth of threads in the head. If you tap them to the bottom you can sometimes get a longer bolt in there. I went from 3/4 to 1 inch long bolts by bottom tapping. The extra threads seem to help hold better. I used Permatex teflon thread sealer on the threads and Fel-Pro 1404 gaskets. 3 years and tick free.
I also used locking bolts, along with Earls carbon fiber gaskets.
The bolts are sold by Ford, summit has em, 1" long, combo hex and allen head, with a locking ring held on by an e clip. You get 2 spares, kinda nice.
The gaskets haven't burned and the bolts can't come loose ever.
And yes, stainless bolts into alluminum heads = use anti sieze
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