Edelbrock Performer RPM 2-R Intake Manifold for Chevrolet 396-502 Big-Block V8Edelbrock part #7163 Performer RPM 2 R intake manifold is designed for street 396 502 c. i. d. Chevrolet V8's with high performance rectangular port cylinder heads. This dual plane high rise manifold offers maximum horsepower with a broad torque curve. No provisions for exhaust heated chokes. Accepts late model waterneck, air conditioning, alternator and HEI equipment.