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The Edelbrock RPM Air-Gap 2-O intake manifold for 396–502 ci Big-Block Chevy engines with large oval-port heads (1966–2000 coverage) uses an Air-Gap to separate runners from engine heat for a cooler, denser charge and improved power. It includes rear water outlets, distributor clamp locations and nitrous bosses, and accepts late-model accessory brackets. Note: no provision for exhaust-heated chokes or crossover; some hood clearances may be restricted.
Edelbrock B/B Chevy O-Port RPM Air-Gap Manifold
