Created page with "By 1937, all Harley-Davidson's flatheadengines were equipped with dry-sump oil recirculation systems similar to the one introduced in the "Knucklehead" OHV e..."
(Created page with "By 1937, all Harley-Davidson's flatheadengines were equipped with dry-sump oil recirculation systems similar to the one introduced in the "Knucklehead" OHV e...")