Created page with "Used by all Harley-Davidsons since the Panhead of 1949. The valves are opened by hydraulic pressure rather than solid pushrods, the advantages being quieter running and l..."
(Created page with "Used by all Harley-Davidsons since the Panhead of 1949. The valves are opened by hydraulic pressure rather than solid pushrods, the advantages being quieter running and l...")