true exhaust manifold bolts should be hollow like skip mentioned, or at least all the ones i have seen are. i think that allows for expansion when they heat up. the 3/8-16 thread is correct & im pretty sure they are flanged. not sure if ALL the bolts are the same length though, some manifolds are thicker in some spots so take a longer bolt.
i found the hollow style bolts at my local ACE hardware store. they werent in the big bins with standard bolts they were in teh plastic slide out boxes for specialty itmes.
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