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Chevrolet Big Block Phenolic Spacer

9c. This carb also features annular boosters, polished venturi surfaces, Teflon-coated throttle shafts, and stainless steel throttle plates and hardware. Before the carb was bolted to the manifold, we slid-in a combination phenolic spacer to isolate the base of the carb from the hot manifold.
Chevrolet Big Block Engine - The Big-Block From Hell

9c. This carb also features annular boosters, polished venturi surfaces, Teflon-coated throttle shafts, and stainless steel throttle plates and hardware. Before the carb was bolted to the manifold, we slid-in a combination phenolic spacer to isolate the base of the carb from the hot manifold.  View Related Article