Performer 351-4V is designed for street 351C and Boss 351 Fords that came stock with 4V carb and heads. Performer 351-2V is designed for street 351C and accepts 4V carb, however it's designed to improve the performance of engines that came stock with 2V carb and heads. Neither Manifolds will fit Boss 302 or accept stock Motorcraft spread-bore carb. End-seal flange width measures 6-31/32".
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