HL-304WX Carburetor is our workhorse; we build more carburetor base on this model than all others. EC Carburetors Design this carburetor about 2004 when the OHV 4 cycle engines started taking over the Flathead. There was no clear direction on what brand engine or what modification would take place so EC had this carburetor manufactures with pilot holes for all the fuel orifices and (Called it an Engine builder carburetor) So engine builder could tweak the fuel curve as they felt necessary. 875” infinite Venturi with a 1.000: throttle bore. Has an up-pull shaft double-stack pump plates. This carburetor will not run stock out of the box, modifications by an expert carburetor or engine builder are required.