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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-11-770-8
Xtreme Energy Mechanical Roller Camshaft Big Block Chevy 1965-96 Lift: .639"/.646"
$57795
Ships on 09/15/2026
Lowest Price GuaranteeChevy 396-454ci Big Block 1965-96
- Xtreme Energy Mechanical Roller Camshaft
- Lift: .639"/.646"
- Duration: 274°/280°
- Lobe Separation Angle: 110°
- RPM Range: 2200-6200
Mechanical Roller-Great for Power Touring. Needs 2500 stall, easy on parts. Very reliable power. Rough idle.Chevelle, Camaro, Corvette, Stingray, Silverado, C10, Firebird, Chevrolet, Big Block, Chevy, BBC, 454, 427, 502, 396, Caprice, Malibu, Impala, Nova, Monte Carlo, S10, 572
Great for Power Touring. Needs 2500+ stall, easy on parts. Very reliable power. Rough idle.
Big Block Chevy 1965-96
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Part TypeCamshaft
BrandCOMP CAMS
Package Height2.75
Package Width8.05
Package Length24.35
Weight10.35 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)242
Cam StyleMechanical roller tappet
Grind NumberCB XR274 R-10
Exh. Duration Advertised (Deg)280
Engine Make/SizeChevy Big Block (396-454)
Intake Valve Lift With Factory Rocker Arm Ratio (I0.639
Int. Duration @ .050 In. (Deg)236
Basic Operating Rpm Range2,200-6,200
Intake Valve Lash0.016 in (0.406 mm)
Intake Valve Lift0.639 in (16.231 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)274
Lobe Separation (Deg)110
Rpm Range2200-6200
Advertised Duration274 int./280 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.646
UsageStreet/Performance
Valve Lift With Factory Rocker Arm Ratio0.639 int./0.646 exh.
QuantitySold individually
Exhaust Valve Lash0.018 in (0.457 mm)
Exhaust Valve Lift0.646 in (16.408 mm)
Advertised Intake Duration274
Intake Duration At 050 Inch Lift236
Exhaust Duration At 050 Inch Lift242
Advertised Exhaust Duration280
Lifter TypeMechanical Roller
Part FitmentSemi Universal
Duration At 050 Inch Lift236 int./242 exh.
Valve Springs RequiredYes
Vendor Part Number11-770-8
Package Qty1
Package TypeEA
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