Edelbrock RPM Air-Gap AMC Intake Manifold for AMC 304-360-401 Small-Block V8Edelbrock part #7531 RPM Air Gap AMC intake manifold is designed for 1970 91 304 401 c. i. d. V8 applications. The RPM Air Gap intake manifold incorporate the same race winning technology as our Victor Series competition intakes. The air gap design features an open air space that separates the runners from the hot engine oil for a cooler, denser charge and more power. Includes standard oil fill and PCV provisions as well as early air conditioning