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. Includes rear water outlets, two distributor clamp locations and nitrous bosses. Accepts all 1976 and later alternator and A/C brackets for the street. The heater outlet boss is angled for proper fit over the valve cover. The temp sensor boss clears all waternecks. For square-bore carburetors only. No provision for exhaust heated chokes and no exhaust crossover. Not for 1987 and later cast iron heads or L98 cylinder heads. Will not fit under stock Corvette hood.