{"product_id":"comp-cams-ford-small-block-camshaft-complete-kit-fs-291th-hr07-thumpr","title":"COMP Cams Ford Small Block Camshaft Complete Kit FS 291TH HR07 Thumpr","description":"The 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.\nThe 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.\n\u003cul\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\u003eFeatures full-size base circles, works seamlessly with our Comp Cams Evolution hydraulic roller tappets.\u003c\/li\u003e\n  \u003cli\u003eSupersedes K31-601-8\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\n\u003cbr\u003e\n\u003cbr\u003e\nAir Freight Prohibited: false\u003cbr\u003e\nNot Carb Approved: true\u003cbr\u003e\nCarb Acknowledgement Required: true\u003cbr\u003e\nLtl Freight Required: false\u003cbr\u003e\nProp 65: Y\u003cbr\u003e\nPart Type: automotive\u003cbr\u003e\nEpa: N\/A\u003cbr\u003e\nUnits Per Sku: 1","brand":"COMP Cams","offers":[{"title":"Default Title","offer_id":49298331107547,"sku":"ccaK31-601-9","price":1523.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0797\/8559\/1003\/files\/4f78b83512464a02ea003acacdd601b3L_4f44249f-afb6-4761-adbb-a8800cf5d06c.jpg?v=1789188732","url":"https:\/\/hnbperformance.com\/products\/comp-cams-ford-small-block-camshaft-complete-kit-fs-291th-hr07-thumpr","provider":"Hellnback Offroad \u0026 Performance","version":"1.0","type":"link"}