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Good morning, I have two sets of exh. manifolds to choose from, an older set of A body 318's and a later model set from an '88 M body 318. The first question is what are all the extra holes on the later manifold. They were all plugged up from crap and could not have helped anything. The...

Two actually: 1. The heat riser has a coiled spring attached to the weight. On my manifold there is what appears to be a second spring end which is not attached to anything. Where does it go? See pic. 2. On the opposite side of the weight there are two "posts". One is the rod that the...