{"product_id":"comp-cams-camshaft-p8-283th-r7-thumpr","title":"Comp Cams Camshaft, P8 283Th R7 Thumpr - 51-600-11","description":"\u003cp\u003eThumpr 227\/241 Hydraulic Roller Cam for Pontiac 265-455\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Pontiac 265-455 V8\u003c\/p\u003e\n\u003cp\u003eHigh performance street, stock converter ok, best with 2000+ converter and gears, choppy\/thumping idle.\u003c\/p\u003e\n\u003cp\u003eThumpr 227\/241 Hydraulic Roller Cam\u003c\/p\u003e\n\u003cp\u003eDesigned to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods, the Thumpr series' early intake valve opening and long exhaust duration create optimum overlap for that race car idle. The Thumpr grinds all require an aftermarket torque converter and lower gear ratio to ensure the drivetrain always puts the engine in its powerband. Additionally, Thumpr camshafts typically deliver reduced vacuum at idle, making a vacuum canister, pump or hydroboost a requirement for vehicles running power brakes.\u003c\/p\u003e\n\u003cp\u003eDesigned to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods, the Thumpr series' early intake valve opening and long exhaust duration create optimum overlap for that race car idle. The Thumpr grinds all require an aftermarket torque converter and lower gear ratio to ensure the drivetrain always puts the engine in its powerband. Additionally, Thumpr camshafts typically deliver reduced vacuum at idle, making a vacuum canister, pump or hydroboost a requirement for vehicles running power brakes.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEarly intake valve opening and long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note.\u003c\/li\u003e\n\u003cli\u003eThree unique cam designs for each application that deliver excellent horsepower gains and broad torque curve; perfect choice for muscle cars and street rods.\u003c\/li\u003e\n\u003cli\u003eBest with aftermarket converters and more rear gear.\u003c\/li\u003e\n\u003cli\u003eEarly intake valve opening and long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note.\u003c\/li\u003e\n\u003cli\u003eBest with aftermarket converters and more rear gear.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"COMP Cams","offers":[{"title":"Default Title","offer_id":53236902625643,"sku":"CCA51-600-11","price":674.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/9690\/4998\/files\/51-000-9_20Cam_dc331b73-5997-4135-a8ec-aa4099a66a51.jpg?v=1779727619","url":"https:\/\/www.raptorracing.com\/products\/comp-cams-camshaft-p8-283th-r7-thumpr","provider":"Raptor Racing","version":"1.0","type":"link"}