Edelbrock Performer RPM 2-R Intake Manifold for Chevrolet 396-502 Big-Block V8Edelbrock part #7562 RPM Air Gap 2 R intake manifold is designed for street 396 502 c. i. d. Chevrolet V8's with high performance rectangular port heads. The open air space separates the runners from the hot engine oil, and as a result, the air fuel mixture stays cooler for a denser charge and more power Includes rear water outlets, two distributor clamp locations and nitrous bosses. Accepts all late model alternator and A C brackets for the street.