{"product_id":"kpmi-black-diamond-exhaust-valve-m8-1-284-os-inconnel-191-17045","title":"KPMI Black Diamond Exhaust Valve - M8 1.284 OS Inconnel — Harley-Davidson Road King, Road King Special, Electra Glide Ultra Classic (2017-2019)","description":"\u003cp\u003eKPMI Black Diamond exhaust valve for Harley Milwaukee-Eight (M8) engines, oversized 1.284 in. with Inconel construction and proprietary Black Diamond surface hardening. One-piece forging delivers superior wear resistance, reduced friction, and corrosion protection compared to plated alternatives.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eBlack Diamond® surface hardening to .002 in depth\u003c\/li\u003e\n  \u003cli\u003eInconel construction for high-temperature durability\u003c\/li\u003e\n  \u003cli\u003eOne-piece forging design\u003c\/li\u003e\n  \u003cli\u003eOptimized flow profile\u003c\/li\u003e\n  \u003cli\u003eLight weight at 0.2 lbs\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 20-21018K\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Inconel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eValve Size:\u003c\/strong\u003e 1.284 in oversized\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 3.5 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 7.12 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 1.5 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.2 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat is the Black Diamond process?\u003c\/h3\u003e\n\u003cp\u003eGerman proprietary hardening that impregnates stainless steel to .002 in depth, improving wear resistance and corrosion protection over chrome or nickel plating.\u003c\/p\u003e\n\u003ch3\u003eWill these fit my M8 engine as-is, or do I need porting?\u003c\/h3\u003e\n\u003cp\u003eVerify your M8 cylinder head is set up for 1.284 in oversized valves. Stock M8 heads may require machine work to accept these.\u003c\/p\u003e\n\u003ch3\u003eAre these valves used for intake or exhaust?\u003c\/h3\u003e\n\u003cp\u003eThis is an exhaust valve. Intake valves require a separate part number.\u003c\/p\u003e\n\u003ch3\u003eWhat makes Inconel better than stainless steel?\u003c\/h3\u003e\n\u003cp\u003eInconel handles higher temperatures and retains strength better in exhaust applications, making it ideal for high-performance M8 engines.\u003c\/p\u003e","brand":"KPMI","offers":[{"title":"Default Title","offer_id":53035797741679,"sku":"191-17045","price":41.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/c8b5-677ec0af25a33_05016407-4592-4527-a178-f88f4f68739d.jpg?v=1777529359","url":"https:\/\/vtwinbikers.com\/products\/kpmi-black-diamond-exhaust-valve-m8-1-284-os-inconnel-191-17045","provider":"Vtwinbikers","version":"1.0","type":"link"}