Nope. That is a vacuum port for your original vacuum wipers. Unless someone else does, I'll get you a pic of the heat stove setup in a day or two (my truck isn't at home right now).
-Tim
'51 Chevy 3104 w/'56 235, 848 Head, HEI Dizzy, Corvette Cam, Split Manifold and Dual Carter YF's
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