Order Status & Returns
Gift Cards
Help Center
1-800-345-4545
Vehicle Info NeededCOMP CAMSPART NUMBER: 249-11-423-8
Comp Cams Xtreme Energy Hydraulic Roller Camshafts
$57795
Ships on 09/08/2026
Lowest Price GuaranteeChevrolet Big Block 396-454 c.i. 8 CYL. 1965-1996
- Xtreme Energy Retro-Fit XR276HR-10 Hydraulic Roller Camshaft
Lift: .510"/.510"
Duration: 276/282
Lobe Separation Angle: 110°
RPM Range: 1900-5600
Hydraulic Roller-Great for Street Machines, needs intake, headers, stall, and gears.
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 street machines, needs intake, headers, 2000+ stall and gears.
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 Height2.7
Package Width4.9
Package Length24.4
Weight10.97 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)230
Cam StyleHydraulic roller tappet
Grind NumberCB XR276HR-10
Exh. Duration Advertised (Deg)282
Engine Make/SizeChevy Big Block (396-454)
Intake Valve Lift With Factory Rocker Arm Ratio (I0.51
Int. Duration @ .050 In. (Deg)224
Basic Operating Rpm Range1,900-5,600
Intake Valve Lift0.51 in (12.954 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)276
Lobe Separation (Deg)110
Rpm Range1900-5600
Advertised Duration276 int./282 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.51
UsageStreet/Performance
Valve Lift With Factory Rocker Arm Ratio0.510 int./0.510 exh.
QuantitySold individually
Exhaust Valve Lift0.51 in (12.954 mm)
Advertised Intake Duration276
Intake Duration At 050 Inch Lift224
Exhaust Duration At 050 Inch Lift230
Advertised Exhaust Duration282
Lifter TypeHydraulic Roller
Part FitmentSemi Universal
Duration At 050 Inch Lift224 int./230 exh.
Valve Springs RequiredYes
Vendor Part Number11-423-8
Package Qty1
Package TypeEA
No Questions
No Reviews
Items You Need
![Break-In/Engine Oil Supplement [12 oz. Bottle]](https://www.jegs.com/images/mini_200/500/555/555-28060.jpg)
![Valve Spring Compressor [Stud Mount]](https://www.jegs.com/images/mini_200/500/555/555-80521.jpg)
COMP CAMS
Magnum Roller Rocker Arms Chevy Big Block 396-454/Ford Boss 302, 351C-400M, 429-460
Part Number : 249-1411-16
$23895
COMP CAMS
10° Super Lock Steel Retainers Valve Spring Diameter: 1.500" to 1.550"
Part Number : 249-741-16
$9095
![Engine Assembly Lube [4 oz. Bottle]](https://www.jegs.com/images/mini_200/500/555/555-28000.jpg)
COMP CAMS
Short Travel Race Hydraulic Roller Lifters Big Block Chevy 396-454 1965-96
Part Number : 249-15854-16
$78195
COMP CAMS
Composite Distributor Gear Small and Big Block Chevy .491" Shaft Diameter With Beveled Tooth
Part Number : 249-12200
$15995
COMP CAMS
Magnum Double Roller Timing Set 1965-91 Chevy Big Block V8 396-454
Part Number : 249-2110
$11695
![Valve Spring Compressor [Stud Mount]](https://www.jegs.com/images/mini_200/500/555/555-80518.jpg)
COMP CAMS
High Energy Pushrod Set Chevy 396-454ci w/Retro-Fit Hydraulic Roller Cam
Part Number : 249-7815-16
$6695
COMP CAMS
10° Super Lock Steel Retainers Valve Spring Diameter: 1.500" to 1.550"
Part Number : 249-748-16
$9095
![Precision Cam Degree Wheel Kit [11 in.]](https://www.jegs.com/images/mini_200/500/555/555-81621.jpg)
JEGS
Universal Camshaft Installation/Removal Tool Includes 4 camshaft adapters
Part Number : 555-80599
$4779$51.99
You Save$4.20
![159 Engine Break-In Oil Additive [12-Ounce]](https://www.jegs.com/images/mini_200/200/249/249-159.jpg)
Some parts are not legal for use in California or other states with similar laws / regulations
