{"product_id":"rocket-performance-garage-llc-big-bore-cylinder-kits-kit-124-m8-2017-2024-e-276-02061","title":"Rocket Performance Garage Llc Big Bore Cylinder Kits - KIT 124\" M8 2017-2024 (e… — Harley-Davidson (2017-2024)","description":"\u003cp\u003eRocket Performance Garage 124 cubic-inch big-bore cylinder kit for 2017-2024 Harley Milwaukee-Eight engines, displacing the stock M8 to 124cc with premium USA-cast cylinders and CP forged pistons. Increases displacement and compression for measurable power gains without major engine teardown.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eUSA-cast premium cylinders with textured black powdercoat\u003c\/li\u003e\n  \u003cli\u003eCP forged pistons included\u003c\/li\u003e\n  \u003cli\u003e4.375 in stroke\u003c\/li\u003e\n  \u003cli\u003e10.5:1 compression ratio\u003c\/li\u003e\n  \u003cli\u003eMachined fins for stock OEM appearance\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 Rocket Performance Garage\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 8-8101\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 124 cubic inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompression Ratio:\u003c\/strong\u003e 10.5:1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePiston Brand:\u003c\/strong\u003e CP (forged)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 9 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 8 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 20 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 25 lbs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits 2017-2024 Harley-Davidson Milwaukee-Eight (M8) engine platforms.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWill this kit fit older Harley engines like the Twin Cam?\u003c\/h3\u003e\n\u003cp\u003eNo — this kit is engineered specifically for 2017-2024 Milwaukee-Eight engines. Twin Cam and earlier platform engines require different big-bore kits.\u003c\/p\u003e\n\u003ch3\u003eWhat compression ratio does this achieve?\u003c\/h3\u003e\n\u003cp\u003e10.5:1 compression, which is designed to work with 91-octane fuel and OEM Harley fuel management on stock M8 bikes.\u003c\/p\u003e\n\u003ch3\u003eAre the cylinders and pistons matched?\u003c\/h3\u003e\n\u003cp\u003eYes. The cylinders are precisely fitted and matched to the included CP forged pistons for proper clearance and performance.\u003c\/p\u003e\n\u003ch3\u003eDo I need a professional engine builder to install this?\u003c\/h3\u003e\n\u003cp\u003eBig-bore kits require cylinder head removal and careful machining. Professional installation is strongly recommended to ensure proper fitment and sealing.\u003c\/p\u003e","brand":"Rocket Performance Garage Llc","offers":[{"title":"Default Title","offer_id":53035941298287,"sku":"276-02061","price":1599.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_50102219-dd60-4113-8999-799ca084d054.png?v=1779563816","url":"https:\/\/vtwinbikers.com\/products\/rocket-performance-garage-llc-big-bore-cylinder-kits-kit-124-m8-2017-2024-e-276-02061","provider":"Vtwinbikers","version":"1.0","type":"link"}