The man at the mill is John McWhirter, one of the founders of Racing Head Service (RHS). On the other side of the camera is Hot Rod magazine staffer Bud Lang, who photographed McWhirter cc’ing a Chevy cylinder head for a February 1971 profile of the Memphis-based shop. At the time, Lang wrote, the NHRA’s rules for Junior and Super Stock drag racers were so restrictive that “the few shops or engine builders specializing in high-performance work on such engines have, over the years, turned otherwise standard valve jobs into a science.” Lang then spent the next four pages explaining in thorough detail how RHS prepped small-block Chevy heads, with McWhirter—“the gentleman in charge of head production”—as his guide.