Edelbrock part #75011 RPM Air-Gap RPM intake manifold is designed for 1955-86 262-400 c.i.d. Chevrolet V8's. The award-winning RPM Air-Gap intake manifold incorporates the same race-winning technology that's used on our Victor Series competition intakes. The air-gap design features an open air space that separates the runners from the hot engine oil resulting in a cooler, denser charge for more power. Edelbrock's Performer RPM gives you the ultimate in street high-performance. Accepts all 1976 and later alternator and A/C brackets for the street. No provision for exhaust- heated chokes and no exhaust crossover. Not for 1987 and later cast iron heads and will not fit under stock Corvette hood. This manifold offers a polished finish for a brilliant shine and classic look.