Designed for 262-400 c. i. d. Chevrolet V8s, the RPM Air-Gap incorporates the same race-winning technology that's been used on our Victor Series competition intakes for years. The Air-Gap design results in a cooler denser charge for more power. The open air space separates the runners from the hot engine oil. As a result, the air/fuel mixture stays cooler all the way to the head. This cooler charge creates more power. Includes rear water outlets, two distributor clamp locations, and nitrous bosses. Accepts all late model 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 and will not fit under stock Vette hood. The Air-Gap Runs the Entire length of the Manifold for a Cool Dense Mixture and More Power. . You Get Outstanding Performance and a Great Looking Manifold!Installation Notes: Use #8504 Edelbrock bolt kit. Recommended intake gasket: Fel-Pro #FEL1205Pit Stop USA offers Edelbrock Performer RPM Air-Gap Intake Manifold - SB Chevy - Polished - (Non-EGR) 75011 at low everyday prices. Be sure to check out all of our products from Edelbrock including Edelbrock Intake Manifolds - Small Block Chevy.