Edelbrock part #7161 Performer RPM 2-O intake manifold is designed for street 396-502 c.i.d. Chevy V8’s with large oval-port cylinder heads (1975 and earlier). This dual-plane high rise intake manifold delivers outstanding horsepower while maintaining good torque and driveability. No provisions for exhaust heated chokes. Accepts late-model waterneck, air-conditioning, alternator and HEI equipment.