Edelbrock 7581 Ford 351 RPM Air Gap Manifold
RPM Air-Gap Ford 351W Intake Manifold - Designed for Ford 351-400 street and high-performance applications. Larger cross-sectional area and a taller carb flange than #350-7181 for compatibility with large displacement, stroker 351W-based engines. Includes nitrous bosses. No provision for exhaust-heated choke and no exhaust crossover.