{"product_id":"kpmi-black-diamond-intake-valve-hd-evolution-1987-1999-191-17001","title":"KPMI Black Diamond Intake Valve - HD Evolution 1987-1999 — Harley-Davidson Electra Glide Classic, Softail Custom, Softail Heritage Classic (1984-1999)","description":"\u003cp\u003eKPMI Black Diamond intake valve for Harley Evolution engines, engineered with stainless steel and treated through a proprietary German impregnation process that reduces friction and improves wear resistance beyond conventional plating methods. One-piece forging design delivers superior flow characteristics and durability.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eBlack Diamond German impregnation process (.002″ depth)\u003c\/li\u003e\n  \u003cli\u003eSuperior wear and corrosion resistance vs. chrome\/nickel plating\u003c\/li\u003e\n  \u003cli\u003eLight, strong one-piece stainless steel forging\u003c\/li\u003e\n  \u003cli\u003eOptimized flow profile design\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e KPMI\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 20-4171\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 4.9 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 3.6 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 1.8 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.23 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits Harley-Davidson Evolution engines 1987–1999.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat makes Black Diamond different from chrome-plated valves?\u003c\/h3\u003e\n\u003cp\u003eBlack Diamond uses a German impregnation process that penetrates .002″ deep, reducing friction and outlasting chrome or nickel plating in wear and corrosion resistance.\u003c\/p\u003e\n\u003ch3\u003eIs this a single valve or a set?\u003c\/h3\u003e\n\u003cp\u003eThis is one intake valve. Order the quantity needed for your engine build.\u003c\/p\u003e\n\u003ch3\u003eWill this fit my Twin Cam Harley?\u003c\/h3\u003e\n\u003cp\u003eNo — this valve is engineered for Evolution-block engines only (1987–1999). Twin Cam engines require different valve specifications.\u003c\/p\u003e\n\u003ch3\u003eDo I need new valve guides and seats?\u003c\/h3\u003e\n\u003cp\u003eIf your cylinder head is being rebuilt or freshened, have the valve seat and guide inspected by a qualified machine shop to ensure proper fitment and sealing.\u003c\/p\u003e","brand":"KPMI","offers":[{"title":"Default Title","offer_id":53035004821615,"sku":"191-17001","price":29.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_d5ef023c-84bc-4cd6-b7d4-06dfc032546f.png?v=1779559002","url":"https:\/\/vtwinbikers.com\/products\/kpmi-black-diamond-intake-valve-hd-evolution-1987-1999-191-17001","provider":"Vtwinbikers","version":"1.0","type":"link"}