{"product_id":"comp-cams-31-601-9-mutha-thumpr-235-249-hydraulic-roller-ford-221-302","title":"COMP Cams 31-601-9 - Mutha' Thumpr 235\/249 Hydraulic Roller, Ford 221-302","description":"\u003cp\u003eCOMP Cams 31-601-9 - Mutha' Thumpr 235\/249 Hydraulic Roller, Ford 221-302\u003c\/p\u003e\u003cp\u003eMutha' Thumpr 235\/249 Hydraulic Roller, 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 31-601-8, 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 31-601-8\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv\u003e\n\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\n\u003cdiv\u003e\n\u003cstrong\u003eIntake Centerline\u003c\/strong\u003e: \u003cspan\u003e102\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eComputer Controlled Compatible\u003c\/strong\u003e: \u003cspan\u003eNo\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: \u003cspan\u003eBillet Steel\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eExhaust Valve Lift with Factory Rocker Arm Ratio\u003c\/strong\u003e: \u003cspan\u003e0.526\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eIntake Valve Lift with Factory Rocker Arm Ratio\u003c\/strong\u003e: \u003cspan\u003e0.541\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eLobe Separation\u003c\/strong\u003e: \u003cspan\u003e107\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eExhaust Lobe Lift\u003c\/strong\u003e: \u003cspan\u003e0.329\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eIntake Lobe Lift\u003c\/strong\u003e: \u003cspan\u003e0.338\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eExhaust Duration at .050 inch Lift\u003c\/strong\u003e: \u003cspan\u003e249\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eIntake Duration at .050 Inch Lift\u003c\/strong\u003e: \u003cspan\u003e235\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eAdvertised Exhaust Duration\u003c\/strong\u003e: \u003cspan\u003e311\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eAdvertised Intake Duration\u003c\/strong\u003e: \u003cspan\u003e291\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eEngine Platform\u003c\/strong\u003e: \u003cspan\u003eFord Small Block\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eCam Type\u003c\/strong\u003e: \u003cspan\u003eHydraulic Roller\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eFuel Management Strategy Compatible\u003c\/strong\u003e: \u003cspan\u003eNo\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eVVT Compatible\u003c\/strong\u003e: \u003cspan\u003eNo\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eDirect Injection\u003c\/strong\u003e: \u003cspan\u003eNo\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eFiring Order\u003c\/strong\u003e: \u003cspan\u003eFS\/FF\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eBasic Operating RPM Range\u003c\/strong\u003e: \u003cspan\u003e2200 - 5900\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eExhaust Valve Lash\u003c\/strong\u003e: \u003cspan\u003eHyd\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eIntake Valve Lash\u003c\/strong\u003e: \u003cspan\u003eHyd\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eFactory Rocker Ratio\u003c\/strong\u003e: \u003cspan\u003e1.6\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eAdvance\u003c\/strong\u003e: \u003cspan\u003e5\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eLifter Type\u003c\/strong\u003e: \u003cspan\u003eRoller Tappet\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eCamshaft Series\u003c\/strong\u003e: \u003cspan\u003eThumpr\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eValve Springs Required\u003c\/strong\u003e: \u003cspan\u003eYes\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"COMP Cams","offers":[{"title":"Default Title","offer_id":51622586581270,"sku":"COMP-31-601-9","price":562.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0930\/0878\/9782\/files\/0_31-493-9_camshaft_v1_normalized.jpg?v=1785353033","url":"https:\/\/www.cspracing.com\/products\/comp-cams-31-601-9-mutha-thumpr-235-249-hydraulic-roller-ford-221-302","provider":"Complete Street Performance","version":"1.0","type":"link"}