72 340 pass side manifold

GSS said

And the matching left side manifold is 2.25", is that correct?
Is there any right side 2.25" manifold that exits straight down in the center like 3418623?
I think I have seen some dyno numbers with different manifolds, but I can't find them. What does the smaller outlet translate to in terms of HP or performance?

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There are no dyno numbers for the JGC manifolds (that I have seen). The JGC is 2 1/8" which is as close as you're going to get without spending lots of money. The individual port are pretty good size also. The JGC does not exit in the center like the 623. It exits a little more towards the rear where there is plenty of room/space. You can easily grind out the JGC to more than 2 1/4".