– Inlet: Late – Head attachment bolt size: 5/16″ – Does bracket use reduction washers?: Yes – Requires 505717 adapter: No – Dimensions (A) = cen width to center width of mount bolts in head: 5-51/16″ – Dimensions (B) = overall height of bracket: 1-7/16″ – Dimensions (C) = bolt height measured from center of carb mount: 1-5/16