{"product_id":"s-s-640-cam-for-evo-big-twin","title":"S\u0026S, 640 cam for Evo Big Twin","description":".640\" valve lift. Big inch engines with 10.5\/11.5:1 CR. Smaller engines with 11:1 to 12:1 CR. With lower TDC lifts; faster ramps and shorter duration it builds higher cyl. pressure and requires less CR and offers a more linear power delivery as the 631. Supplied with the S\u0026amp;S 124\" SSW+ engines. 3000-6000 RPM.\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e 84-99 Evo Big Twin (NU)\u003c\/p\u003e","brand":"S\u0026S","offers":[{"title":"Default Title","offer_id":54307938828615,"sku":"503601","price":306.28,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0987\/7812\/0519\/files\/503562k_48290571-ab40-41ac-8fdc-9d9f882edcfd.jpg?v=1784487509","url":"https:\/\/www.chopperessentials.com\/products\/s-s-640-cam-for-evo-big-twin","provider":"Chopper Essentials Co.","version":"1.0","type":"link"}