Single Plane 4150 Intake Manifold, Small Block Ford, 221, 260, 289, and 302 ci. Non-Boss Engines, 2500-7500 RPM Power Band, 4150 Square Bore Flange Carburetors or Throttle Bodies, Isolated (Air-Gap) Plenum, Satin Finish|Holley 300-277 Single Plane 4150 Single Plane Intake Manifold Small Block Ford.