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It's the same piece from 83-94 as far as I can remember. I would guess the hose is closer to 2". So what are you wanting to put it on, enquiring minds wanna know?
Let me think here, Nissan SD-33T I bet... In a Scout, or possibly a certain 91 F150...
I'll grab a couple pics of the neck on my 6.9 this afternoon.
Hose I think is 2"