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| In 1928, H-D authorized the design of an entirely new 45 cubic inch race motor with the hope of regaining their formerly dominant position in American racing. Harley's new motor, an overhead-valve 45 cataloged as the "DAH," made its debut at a Pittsburgh, Pennsylvania hillclimb in July of 1929. |
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Installed: April 12, 1997 Revised: June 28, 2003 |