Comp Cams  Xtreme Energy  Hydraulic Flat Tappet Camshafts
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COMP CAMSPART NUMBER: 249-11-242-20

Comp Cams Xtreme Energy Hydraulic Flat Tappet Camshafts

$42295
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Chevy 396-454ci Big Block 1965-96
XTREME ENERGY 268H-10 Hydraulic Flat Tappet Nitrided Camshaft
Lift .515"/.520"
Duration 268°/280°
RPM Range 1600 to 5800
Lobe Center Angle 110°

Good for street machines, slightly rough idle, stock converter will work but best with 1800+ stall. COMP Cams is the only aftermarket valve train company in America that provides a Pro Plasma Nitriding Service in-house. Nitriding is a process by which nitrogen is introduced into iron or steel, causing a material's surface hardness to be increased for improved initial and long-term wear characteristics. It is recognized by metallurgists worldwide as the best way to increase the hardness and lubricity of flat tappet cams to enhance break-in and durability. Don't get blinded by shiny surface finishing or heat-treating - nitriding has been race-proven around the world and documented to deliver superior results. 

  • Stage 1: Pre-nitrided, unfinished camshaft
  • Stage 2: Nitrided camshaft surface approximately .008"-.010" deep; black oxide finish

Chevelle, Camaro, Corvette, Stingray, Silverado, C10, Firebird, Chevrolet, Big Block, Chevy, BBC, 454, 427, 502, 396, Caprice, Malibu, Impala, Nova, Monte Carlo, S10, 572


Good for street machines, slightly rough idle, stock converter will work but best with 1800+ stall. Nitrided.

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.

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Part TypeCamshaft
BrandCOMP CAMS
Package Height2.9
Package Width2.9
Package Length24.3
Weight10.83 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)230
Cam StyleHydraulic flat tappet
Grind NumberXE268H
Exh. Duration Advertised (Deg)280
Engine Make/SizeChevy Big Block (396-454)
Intake Valve Lift With Factory Rocker Arm Ratio (I0.515
Int. Duration @ .050 In. (Deg)224
Basic Operating Rpm Range1,600-5,800
Intake Valve Lift0.515 in (13.081 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)268
Lobe Separation (Deg)110
Rpm Range1600-5800
Advertised Duration268 int./280 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.52
UsageStreet/Strip
Valve Lift With Factory Rocker Arm Ratio0.515 int./0.520 exh.
Camshaft Gear Attachment3-bolt
QuantitySold individually
Exhaust Valve Lift0.52 in (13.208 mm)
Advertised Intake Duration268
Intake Duration At 050 Inch Lift224
Exhaust Duration At 050 Inch Lift230
Advertised Exhaust Duration280
Lifter TypeHydraulic Flat Tappet
Part FitmentSemi Universal
Duration At 050 Inch Lift224 int./230 exh.
Valve Springs RequiredYes
Vendor Part Number11-242-20
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
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