{"product_id":"harley-davidson-knucklehead-eighty-years-greg-field","title":"Harley-Davidson Knucklehead: Eighty Years;  Greg Field","description":"\u003cdiv data-testid=\"description\" class=\"BookPageMetadataSection__description\"\u003e\n\u003cdiv class=\"TruncatedContent\" tabindex=\"-1\"\u003e\n\u003cdiv class=\"TruncatedContent__text TruncatedContent__text--large TruncatedContent__text--expanded\" data-testid=\"contentContainer\" tabindex=\"-1\"\u003e\n\u003cdiv class=\"DetailsLayoutRightParagraph\"\u003e\n\u003cdiv class=\"DetailsLayoutRightParagraph__widthConstrained\"\u003e\u003cspan class=\"Formatted\"\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 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 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\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003eNovember 21, 2016\u003c\/p\u003e","brand":"FREEAIR Books","offers":[{"title":"Default Title","offer_id":52933693866306,"sku":null,"price":13.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0730\/8735\/3154\/files\/harleydave.jpg?v=1776367313","url":"https:\/\/shop.freeairbooks.com\/products\/harley-davidson-knucklehead-eighty-years-greg-field","provider":"FREEAIR Books","version":"1.0","type":"link"}