{"product_id":"s-s-cycle-engines-harley-davidson-softail-models","title":"S\u0026S Cycle Engines — Harley-Davidson Softail Heritage Classic, Softail Fat Boy, Softail (1983-2026)","description":"\u003cp\u003eS\u0026amp;S Cycle MK136B is a 136-cubic-inch complete crate engine for 2018-2024 Harley-Davidson Softail models, built on billet MKB-Series crankcases with high-flow cylinder heads and premium valvetrain components. Race-only application, not street-legal.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e136 cubic inch displacement\u003c\/li\u003e\n  \u003cli\u003eHigh-flow cylinder heads with premium seats and guides\u003c\/li\u003e\n  \u003cli\u003e1mm oversized intake and exhaust valves\u003c\/li\u003e\n  \u003cli\u003e.605\" max lift valve springs\u003c\/li\u003e\n  \u003cli\u003eValves .030\" longer than stock\u003c\/li\u003e\n  \u003cli\u003eBillet aluminum covers\u003c\/li\u003e\n  \u003cli\u003eSprocket shaft spacer included\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 S\u0026amp;S Cycle\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 310-1295\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 136 cubic inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 135 lb\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Race-only\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits 2018-2024 Harley-Davidson Softail models with M8 mounting points. Race-only; not intended for street use.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWill this fit my 2017 or older Softail?\u003c\/h3\u003e\n\u003cp\u003eNo — this MK136B engine is designed for 2018-2024 Softail models with M8 compatibility. Older Softails require different crate engines.\u003c\/p\u003e\n\u003ch3\u003eIs this street-legal?\u003c\/h3\u003e\n\u003cp\u003eNo — S\u0026amp;S rates this engine for race-only use. It is not intended for street application.\u003c\/p\u003e\n\u003ch3\u003eWhat crankcases does this use?\u003c\/h3\u003e\n\u003cp\u003eBillet MKB-Series crankcases, which are matched to the 136-inch cylinder package and high-flow heads.\u003c\/p\u003e\n\u003ch3\u003eDoes it come complete and ready to install?\u003c\/h3\u003e\n\u003cp\u003eYes — all premium internal components, heads, covers, and necessary hardware are included. You provide the frame and ancillary systems.\u003c\/p\u003e\n\u003ch3\u003eWhat makes the valvetrain different from stock?\u003c\/h3\u003e\n\u003cp\u003eValves are .030\" longer with 1mm oversizes, premium springs rated to .605\" lift, and improved geometry for high-RPM flow.\u003c\/p\u003e","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":53040432840815,"sku":"T14-887236","price":42385000.0,"currency_code":"COP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_ae92d12c-1f37-45c6-a33b-086546978f03.png?v=1779567288","url":"https:\/\/vtwinbikers.com\/en-co\/products\/s-s-cycle-engines-harley-davidson-softail-models","provider":"Vtwinbikers","version":"1.0","type":"link"}