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1st Gen Ram Tech'93 & older Rams: This section is for TECHNICAL discussions only, that involve 1993 Rams and older. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I got a pair of 318 magnum manifolds with the magnum heads I bought. They look like they could make a great flow improvement over the old 318 cast iron manifolds. I believe they have a 2-1/4 outlet.
Bolt patterns are the same but my LA manifolds for example ('84) have ports below the main exhaust to pump air into the heads as part of the emissions system. If your heads have the air ports you'll be leaking exhaust as the magnums dont cover these up.