insulator
Jeff's right. It's an insulator that keeps engine heat out of the carb to keep from percolating the fuel in the float bowl. Leave it on. It doesn't restrict air flow.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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