In 1923, H-D changed the crankcase design of their 2-cam race motor. Included in the change was a new timing case cover that resembled a "kidney bean," replacing the earlier "banjo-shaped" cover. As in its predecessor, the lifter blocks in the new motor were cast into the crankcase. The valves were operated via pivoted cam followers, sometimes called "roller arms" or "lifter arms," which acted upon the pushrods or the valve stems. Consequently, this version of the H-D 2-cam race motor was known as an "indirect-action" 2-cam.
Installed: April 12, 1997|
Revised: June 28, 2003