Here is a right and left hand 70s 340 exhaust manifold set. The "center dump" (bottom one) is 1 7/8" exit hole. All other 340 manifolds are 2 1/4".
You see that little diamond shaped casting on the 9376 manifold. The one I just picked up today actually is a hole. A pipe was attached to it. I think it must have been for an EGR valve? I figure I'll just block it with a piece of metal.
Any idea or thoughts on what it is for?
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the 96/97/98 Jeep Grand Cherokee passenger manifold (9376 casting #) is 2 1/8" exit hole and will fit perfectly in your car, it's also way cheaper than a 340 large hole manifold although it is not center dump:
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