Name is Christopher... live in eastern wa. I play around with old mopars....been reading for some time..well to the question..I have a A body exhaust manifold.casting #2863553. has a 21/2 in flange.. I want to use it on a 318.going in my 48 ply biz cp.because it curls around the steering nicely..It [I believe ] is off of a 340 being that it has a 2 1/2 in flange and much largers ports then the 318 heads. could this affect how the engine runs when the pass side exhaust is 1 3/4 flange.if I reduce [the driver side]to the same 1 3/4 I do have another manifold but it aims the outlet right at the original clutch linkage. that I hope to use for the 833od..were this one dumps down.any info app. thanks Chris

Christopher, of course there will be an "inbalance" of the exhaust flow however if your not building a "high RPM" motor you will be fine as is.

What Noblewk said, fine as is. It is a 340 HP manifold w 2&1/4 outlet.

Thanks guys, I don't know much about this engine. except it reportedly ran strong , before someone stole the carb.it has ,mopar valve covers, and a edelbrock preformer, so someone dressed it up. did not have this manifold on it. may do some looking around to find a 318 version . [if out there]this one should be on a restored 340 somewhere..Chris...