For the past fifty years and more, Harley-Davidson has been ruling some racing roosts. Its competition iron has always been significant, often supremely victorious and never without passion. To borrow a term from another scene, this is a book about "hog power."What were H-D's competition bikes? How did they fare? And who were the heroes who rode them? Allan Girdler, noted wordsmith, historian and straight-talking H-D enthusiast, digs deep...