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My experience with the 22RE exhaust manifold:Had an exhaust leak, tried tightening rear studs, they pulled out of head.Took off manifold, it was warped, so I needed to get it surfaced so it would seal.Then because I'd lost 2 studs holes, I drilled out all the holes and put in threaded inserts so there was no way they'd pull out again.And because I'm thrifty, I used SAE instead of metric ( 3/8 vs 10mm) and cut to length a stainless steel threaded rod instead of studs. (and stainless nuts). This is a low torque application, so you don't need grade 5 or 8, and stainless is stronger than grade 2 (close to 5) and it won't corrode.
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