{"product_id":"s-s-sidewinder-valve-spring-kit-650-lift","title":"S\u0026S, Sidewinder valve spring kit. .650\" lift","description":"Kit includes beehive springs; chromoly forged top collars; steel bottom collars; valve keepers and shims. Works with both 7mm and 5\/16\" valve stems and all S\u0026amp;S SuperStock® heads (5\/16\") valve stems. Springs are  single wire conical (beehive) style springs; manufactured from clean high silicon Kobe alloy wire then micro shot peened and nitrided. 650\" valve lift. 1.860\" installed height; 178lbs valve seat spring pressure and 376lbs@.650\" lift. Maximum 6500 RPM.\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e 84-99 Evo Big Twin; 99-04 Twin Cam; 86-03 XL Sportster (NU)\u003c\/p\u003e","brand":"S\u0026S","offers":[{"title":"Default Title","offer_id":54307880239431,"sku":"531868","price":326.87,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0987\/7812\/0519\/files\/531868k.jpg?v=1784483937","url":"https:\/\/www.chopperessentials.com\/products\/s-s-sidewinder-valve-spring-kit-650-lift","provider":"Chopper Essentials Co.","version":"1.0","type":"link"}