Edelbrock RPM Air-Gap Intake Manifold for Small-Block Ford - Black Plasma FinishEdelbrock Part PN 7521 BP RPM Air Gap intake manifold is designed for Small Block Ford 289 302 CID based V8's including 331 347 stroker applications. The RPM Air Gap incorporates the same race winning technology that's been used on our Victor Series competition intakes and is the perfect manifold for hot rodders, street custom enthusiasts, bracket racers or any builder looking for optimum performance in the 1,500 6,500 RPM range with a serious look of