Dont bother with the £10 ones IMO, they are just gasket material cut to shape. The TSL ones are the same as OEM subaru use and are several thin layers of metal that can take up any tollerances in the flatness of materials. And are metal so the material won't be the failing factor.
When you use the proper ones, there is a very satisying crunching noise as they do up. If you have a cross thread in one of the header bolts you are going to be fighting with it so the better gasket might pay dividends.
I do fear though it will never seal if the bolt/thread in the block has been torn. Dare I say it, you might have to think about tapping a new/larger thread.
Also be careful if you think about using longer/different bolts to overcome this problem. If the bolt is too long and you over tighten it, it will tear through the block and into the sump. There isn't much material (aluminium) between where the end of the bolt stops and the inner sump chamber.
When you remove the header to block studs, I had a few where the nut came undone but the it left stud in the block, and the stud would not come out. Therefore I had to drop the headers enough, to get past the stud to then slide out the gasket. But hopefully your studs will come out complete.
I originally used the cheap gaskets on one of my scoobs and they never sealed right, so took them out and replaced with the TSL / OEM subaru ones.
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