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Thanks commando1. Maybe next time the heads are off, I'll switch from studs to bolts. Today I found that one nut on the exhaust manifold is missing, probably from jerking the exhaust around when I replaced the muffler a few months ago. So the puffing probably wasn't from the manifold-head...

Any ideas how to better secure the nuts on my 383 exhaust manifold? The passenger side one started leaking recently. I have seen special bolts (12-point?) with retainers, usually for small-block Chevy, but it would be hard and risky to try removing the exiting studs in my head. I am thinking a...