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COMP Cams 11-771-8 Xtreme Energy 242/248 Solid Roller Cam for Chevrolet Big Block 396-454
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Solid roller lifters require a precisely designed camshaft to function correctly in big-block engine applications. The COMP Cams Xtreme Energy XR280R camshaft (part 11-771-8) features 0.646-inch intake and 0.653-inch exhaust valve lift. With 242-degree intake and 248-degree exhaust duration at.050 inch lift across a 2,500-6,500 RPM range, this Austempered Ductile Iron camshaft is built for solid roller lifter systems. The camshaft uses a 3-bolt gear attachment and 110-degree lobe separation and requires Melanized or Nitrided distributor gears; cast or steel gears without surface treatment will void warranties. 1965-66 Big-block 396 c.i.d. models with an oiling groove in the rear journal are not compatible with this camshaft.
- Camshaft Series: Xtreme Energy
- Grind Number: XR280R
- Lifter Type: Solid Roller
- Engine Family: Chevrolet 396-454 c.i. 8 Cylinder (1967-1996)
- Camshaft Material: Austempered Ductile Iron
- Camshaft Gear Attachment: 3-Bolt
- Lobe Separation: 110 deg
- Basic Operating RPM Range: 2,500-6,500 RPM
- Advertised Intake Duration: 280 deg
- Advertised Exhaust Duration: 286 deg
- Intake Duration at.050 Inch Lift: 242 deg
- Exhaust Duration at.050 inch Lift: 248 deg
- Intake Valve Lift: 0.646 IN
- Exhaust Valve Lift: 0.653 IN
- Usage: Street/Performance
- Valve Springs Required: Yes
- Lifters Included: No
- Assembly Lubricant Included: No
- K-Kit Upgrade: K11-771-8
- SK-Kit Upgrade: SK11-771-8
- Cam and Lifter Kit Upgrade: CL11-771-8
- C.A.R.B. Exempt for Racing and Off-Road Only Vehicles?: Yes, but must be a race/competition only vehicle.
- C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965?: Yes, but must meet tailpipe emission standards for year of vehicle.
- C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967?: Yes, but must meet tailpipe emission standards for year of vehicle.
- C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967?: Yes, but must meet tailpipe emission standards for year of vehicle.
Weight: 10.3617 lb
Country of Origin: United States
California Residents: This product can expose you to chemicals which are known to the State of California to cause cancer or other reproductive harm. Please visit www.p65warnings.ca.gov for more information.
Please check the product description for the manufacturer’s application details, or ask a specialist — we’ll confirm whether it fits your vehicle before you buy.
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