The Edelbrock 2261 Rollin' Thunder is a roller-lifter camshaft for 1965-1995 Chevrolet Mark IV and Gen V big-block V8s: 396, 402, 427, 454 and 502 cubic inch. Duration at 0.050 in lift is 236 degrees intake and 245 degrees exhaust, valve lift with factory-ratio rocker arms is 0.625 in intake and 0.639 in exhaust, and lobe separation is 112 degrees. The operating range is 1,500 to 6,500 RPM.
Notes:
- Not for 1965-1966 big-block Chevrolet engines with a grooved rear cam journal.
- Use with a high-stall torque converter and stock-ratio rocker arms only.
- Advertised duration: 335 degrees intake, 329 degrees exhaust.
- Intake centerline: 109 degrees. Idle vacuum: 10 in.
Specifications:
- Brand: Edelbrock
- Part Number: 2261
- Part Type: Engine Camshaft
- Exhaust Valve Lift With Factory Rocker Arm Ratio: 0.639 in
- Series: Rollin' Thunder
- Computer Controlled Compatible: No
- Intake Duration at .050 Inch Lift: 236 deg
- RPM Operating Range: 1500-6500 RPM
- Advertised Intake Duration: 335 deg
- Advertised Exhaust Duration: 329 deg
- Intake Valve Lift: 0.368 in
- Intake Valve Lift with Factory Rocker Arm Ratio: 0.625 in
- Lifter Type: Roller
- Lobe Separation: 112 deg
- Exhaust Duration at .050 inch Lift: 245 deg
- Cam Type: Roller
- Manufacturer warranty: 12 months
Engine Applications
- Chevrolet Big-Block Mark IV: 396 (6.6L), 402 (6.6L), 427 (7.0L), 454 (7.4L), 502 (8.2L)
- Chevrolet Big-Block Gen V: 396 (6.6L), 402 (6.6L), 427 (7.0L), 454 (7.4L), 502 (8.2L)
Vehicle Applications
- Chevrolet: Bel Air 1967-1975; Biscayne 1967-1972; Blazer 1973-1974; Brookwood 1969-1972; C10 1975-1980; C10 Pickup 1968-1974; C10 Suburban 1968-1980; C20 1975-1986; C20 Pickup 1968-1974; C20 Suburban 1968-1986; C30 1975-1986; C30 Pickup 1968-1974; Camaro 1967-1972; Caprice 1967-1976; Chevelle 1967-1973; Chevy II 1968; Corvette 1967-1974; El Camino 1967-1975; Estate 1969-1970; G10 Van 1973-1974; G20 1976; G20 Van 1973-1974; G30 1975-1976; G30 Van 1973-1974; Impala 1967-1976; K10 1976-1980; K10 Pickup 1968-1974; K10 Suburban 1968-1974; K20 1976-1978; K20 Pickup 1968-1974; K20 Suburban 1968-1972; K30 Pickup 1968-1974; K5 Blazer 1976-1978; Kingswood 1969-1972; Laguna 1973-1975; Malibu 1967, 1973-1975; Monte Carlo 1970-1973; Nova 1969-1972; R30 1987-1988; R3500 1989; Townsman 1969-1972; V30 1987-1988; V3500 1989
- GMC: C15 1975-1978; C15 Suburban 1975-1978; C15/C1500 Pickup 1968-1974; C15/C1500 Suburban 1968-1974; C1500 1979-1980; C1500 Suburban 1979-1980; C25 1975-1978; C25 Suburban 1975-1978; C25/C2500 Pickup 1968-1974; C25/C2500 Suburban 1968-1974; C2500 1979-1986; C2500 Suburban 1979-1986; C35 1975-1978; C35/C3500 Pickup 1968-1974; C3500 1979-1986; G25 1975-1976; G35 1976; G35/G3500 Van 1973-1974; K15 1976; K15/K1500 Pickup 1968-1974; K15/K1500 Suburban 1968-1974; K1500 1980; K25 1976-1978; K25 Suburban 1976-1977; K25/K2500 Pickup 1968-1974; K25/K2500 Suburban 1968-1974; K35/K3500 Pickup 1968-1974; K3500 1979-1986; R3500 1987-1989; Sprint 1971-1975; V3500 1987-1989
- Pontiac: Acadian 1968-1971; Beaumont 1967-1969; Laurentian 1967-1970; Parisienne 1967-1970; Strato-Chief 1967-1970
Grouped by make, with model years for each model (79 models, 407 year, make and model combinations).
Fits only vehicles equipped with a Chevrolet Mark IV or Gen V big-block V8. Not for 1965-1966 engines with a grooved rear cam journal.
Emissions Status
- For use on pre-pollution-controlled vehicles: 1965 and older U.S.-manufactured California-certified vehicles, 1967 and older U.S.-manufactured federally certified vehicles, and 1967 and older foreign-manufactured vehicles.
- For engine swaps into uncontrolled or pre-pollution-controlled vehicles. Not legal for use on pollution-controlled vehicles.
FAQ
What engines does the Edelbrock 2261 fit?
It fits Chevrolet Mark IV and Gen V big-block V8s: 396, 402, 427, 454 and 502 cubic inch. It is not for 1965-1966 engines with a grooved rear cam journal.
What are the cam specs of the 2261?
Duration at 0.050 in lift is 236 degrees intake and 245 degrees exhaust, valve lift with factory-ratio rocker arms is 0.625 in intake and 0.639 in exhaust, and lobe separation is 112 degrees.
What does the 2261 require?
Use it with a high-stall torque converter and stock-ratio rocker arms only.
What RPM range is the 2261 built for?
1,500 to 6,500 RPM.
Is the Edelbrock 2261 street legal?
It is not 50-state legal. Its emissions status is for pre-pollution-controlled vehicles and engine swaps into those vehicles.
California Proposition 65: This product can expose you to Chromium, which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.
