{"product_id":"comp-cams-k31-601-9-mutha-thumpr-235-249-hydraulic-roller-evolution-lifter-k-kit-ford-221-302","title":"COMP Cams K31-601-9 - Mutha Thumpr 235\/249 Hydraulic Roller \u0026 Evolution Lifter K-Kit, Ford 221-302","description":"\u003cp\u003eCOMP Cams K31-601-9 - Mutha Thumpr 235\/249 Hydraulic Roller \u0026amp; Evolution Lifter K-Kit, Ford 221-302\u003c\/p\u003e\u003cp\u003eMutha Thumpr 235\/249 Hydraulic Roller \u0026amp; Evolution Lifter K-Kit, Ford 221-302\u003c\/p\u003e\u003cp\u003eThe COMP Cams Mutha Thumpr series delivers aggressive street\/strip performance for Ford Small Block engines, producing a rough lopey idle, strong midrange power, and sharp throttle response. Ideal for 9:1 compression combos with headers.\u003c\/p\u003e\u003cp\u003eThe COMP Cams Xtreme Energy camshaft delivers enhanced street performance for Ford Small Block engines, providing very strong torque and horsepower gains with a smooth idle and responsive throttle—ideal for mild performance upgrades and heavier vehicle applications. Engineered for excellent low- to mid-range power, it works best with proven combinations such as the Edelbrock Performer intake manifold and a TCI Street Rodder or stock torque converter for reliable drivability. Featuring full-size base circles, this camshaft works seamlessly with COMP Cams Evolution hydraulic roller tappets and eliminates the need for dog bones and lifter retainers—components never intended for pre-1985 applications. This camshaft supersedes part number K31-601-8, delivering a dependable upgrade for improved performance and everyday usability.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFeatures full-size base circles, works seamlessly with our Comp Cams Evolution hydraulic roller tappets.\u003c\/li\u003e\n\u003cli\u003eEliminates the need for dog bones and lifter retainers, which were never intended for use in pre-1985 applications.\u003c\/li\u003e\n\u003cli\u003eSupersedes K31-601-8\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv\u003e\u003cdiv\u003e\n\u003cstrong\u003eCross sell \/ Upsell Part Numbers\u003c\/strong\u003e: \u003cspan\u003e89311-16, 1431-16, 431M, 26986-16\u003c\/span\u003e\n\u003c\/div\u003e\u003c\/div\u003e","brand":"COMP Cams","offers":[{"title":"Default Title","offer_id":51622587138326,"sku":"COMP-K31-601-9","price":1502.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0930\/0878\/9782\/files\/0_c_img_k31-493-9_v1_normalized_99b02688-ec6b-4943-b47e-fb373dd3cb95.jpg?v=1785353047","url":"https:\/\/www.cspracing.com\/products\/comp-cams-k31-601-9-mutha-thumpr-235-249-hydraulic-roller-evolution-lifter-k-kit-ford-221-302","provider":"Complete Street Performance","version":"1.0","type":"link"}