{"product_id":"harleydavidson-knucklehead-eighty-years-9780760350430","title":"Harley-Davidson Knucklehead: Eighty Years","description":"\u003cp\u003eCelebrate the 80th anniversary of the engine that changed the motorcycle world. Motorcycle technology lagged far behind automotive technology since the earliest days of the internal-combustion engine. All that changed in 1936 when Harley-Davidson introduced the Model EL. For the first time ever  a company was manufacturing a high-performance overhead-valve engine for the masses. And what an engine it was -- in addition to bringing state-of-the-art technology to the motorcycling world -- a work of art. Because of the shape of its rocker covers  the engine was given a nickname to match its looks: the Knucklehead. The technology used in this engine was so advanced that it laid the foundation for every future Harley-Davidson motorcycle  including the current models built in the 21st century. To this day every cruiser style motorcycle still adheres to the shape of that original Knucklehead. Harley-Davidson Knucklehead: Eighty Years tells the entire Knucklehead story  from the very first overhead-valve V-twin Harley produced for the public through the post-war models  continuing right up until today  when aftermarket manufacturers reproduce complete Knucklehead crate engines because of its continuing popularity.\u003c\/p\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":45924479172661,"sku":"ByrdShop_0760350434","price":243.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8139\/0901\/files\/9780760350430.jpg?v=1787672343","url":"https:\/\/atxbooks.com\/products\/harleydavidson-knucklehead-eighty-years-9780760350430","provider":"ATX Books","version":"1.0","type":"link"}