The Edelbrock Performer RPM 2-O #71614 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 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. The Edelbrock Performer RPM 2-O #71614 intake manifold has a larger plenum and runners to match the free flowing exhaust, high-lift cams and other modifications of a high output engine. The manifold is intended for high-performance street or competition engines that run up to 6500 rpm. Edelbrock’s Performer RPM gives you the ultimate in street high-performance.