Edelbrock part #12851 Vintage Polished Aluminum Fuel Block for triple carb applications is a great way to finish off your fuel system in your hot rod or custom vehicle. The Edelbrock vintage polished aluminum fuel block for triple carb applications features a single 3/8" NPT inlet and three 1/4" NPT outlets. Each fuel block has four holes for mounting to a fire wall and has a polished aluminum finish.