{"product_id":"9780760350430","title":"Harley-Davidson Knucklehead: Eighty Years","description":"\u003cp\u003e\u003cb\u003eCelebrate the 80th anniversary of the engine that changed the motorcycle world.\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003eMotorcycle 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.\u003c\/p\u003e\u003cp\u003eAnd 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.\u003c\/p\u003e\u003cp\u003e\u003ci\u003eHarley-Davidson Knucklehead: Eighty Years\u003c\/i\u003e 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":"Motorbooks","offers":[{"title":"Default Title","offer_id":47015100612848,"sku":"9780760350430","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/9780760350430_p0.jpg?v=1763641197","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/9780760350430","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}