481X/SBC/BBC/Hemi .437" hex long pump extension fuel pump drive shaft. This shaft starts from a piece of .750" chromemoly barstock and is gun drilled to be lightweight. This shaft uses a .625" hex on the cam drive end and a female .437" hex to drive the pump. Can be used to drive and Settles or a Waterman pump. This shaft is 5.50" long. Settles pump may need a male adpt.