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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-12-444-8
Comp Cams Xtreme Energy Hydraulic Roller Camshafts
$57795
Ships on 09/08/2026
Lowest Price GuaranteeChevy 262-400ci Small Block 1955-98
For engines NOT originally equipped with a hydraulic roller camshaft.
For engines NOT originally equipped with a hydraulic roller camshaft.
- Xtreme Energy XR300HR Retro-Fit Hydraulic Roller Camshaft
Lift: .562"/.580"
Duration: 300/306
Lobe Separation Angle: 110°
RPM Range: 3200-6200
Hydraulic Roller-Pro Street / Bracket Racing, 10:1 CR, 3500+ stall, good intake, headers.
265, 283, 307, 302, 305, 327, 350, 383, 400, 427, L46, L48, L65, LM1, LT-1, L82, L81, LS9, L83, L98, L05, LG3, LG4, LT1, LT4, Camaro, Corvette, Chevelle, Stingray, Silverado, C10, Firebird, Chevrolet, Chevy, Small Block Chevy, Caprice, Malibu, Impala, Nova, 355, GEN1, Monte Carlo, S10
Pro Street/bracket racing, 10:1 compression, 3500+ stall, good intake, headers. Very rough idle.
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 Height4.0
Package Width4.0
Package Length24.25
Weight8.69 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)254
Cam StyleHydraulic roller tappet
Grind NumberCS XR300HR-10
Exh. Duration Advertised (Deg)306
Engine Make/SizeChevy Small Block (262-400)
Intake Valve Lift With Factory Rocker Arm Ratio (I0.562
Int. Duration @ .050 In. (Deg)248
Basic Operating Rpm Range3,200-6,200
Intake Valve Lift0.562 in (14.275 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)300
Lobe Separation (Deg)110
Rpm Range3200-6200
Advertised Duration300 int./306 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.58
UsageStreet/Performance
Valve Lift With Factory Rocker Arm Ratio0.562 int./0.580 exh.
QuantitySold individually
Exhaust Valve Lift0.58 in (14.732 mm)
Advertised Intake Duration300
Intake Duration At 050 Inch Lift248
Exhaust Duration At 050 Inch Lift254
Advertised Exhaust Duration306
Lifter TypeHydraulic Roller
Duration At 050 Inch Lift248 int./254 exh.
Valve Springs RequiredYes
Vendor Part Number12-444-8
Package Qty1
Package TypeEA
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