Big Block Chevrolet BBC GM Edelbrock C454 Aluminum Intake Manifold.. Holley Dominator 4500 Flange..Fits only Dominator Carburetors or 4500 Holley 4500..in good condition no strip threads..or cracks.. A carburetor spacer adapter that accepts a Holley 4150 can also be used if a Holley 4150 type or Edelbrock Carburetor is being used on this manifold..