340 Driver's LARGE HOLE Exhaust Manifold

Mopar made two different sizes (exit hole) of 340 exhaust manifolds. Some 340 manifolds are 1 7/8" exit hole and some are 2 1/4". The Large hole (2 1/4" outlet) manifolds flow much better than the small hole.
Mopar also made an even smaller exit hole manifold for the 273/318, it came with a 1 5/8" exit hole.

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