Comp Cams  Xtreme Energy  Hydraulic Roller Camshafts
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COMP CAMSPART NUMBER: 249-08-423-8

Comp Cams Xtreme Energy Hydraulic Roller Camshafts

$57795
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Chevy 305-350ci Small Block 1987-98
For engines originally equipped with a hydraulic roller camshaft, except LT1 and LT4.
    Xtreme Energy XR276 Hydraulic Roller Camshaft (CARBURETED)
    Lift: .502''/.510''
    Duration: 276°/282°
    Lobe Separation Angle: 110°
    RPM Range: 1900-5600


    High Performance street machined, 2000+ Stall converter, lower gear ratio recommended, choppy idle.

    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


    High performance street machines, 2000+ stall, gears, choppy 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.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

The Leading Edge of Valve Train Technology

Comp Cams Xtreme Energy series can be used in any street or street/strip application where both throttle response and top-end horsepower is desired. These camshafts are designed to take advantage of the latest improvements in valve train components and the newest developments in camshaft design. Their aggressive lobe design produces better throttle response and top end horsepower than other cams with the same duration @ .050'' lift, while delivering increased engine vacuum. We do not recommend the use of stock valve train components with these camshafts due to the aggressive lobe designs.

Show More Features:
  • Quicker opening lobe profiles deliver increased responsiveness & more area under the lift curve
  • More vacuum allows an increase in duration for improved performance and assists power brakes
  • Excellent performance in street carbureted applications
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios

    Camshaft & Lifter Kits are indicated by a CL in their part number and include Camshaft, Lifters, Assembly Lube, Decals, and Instructions.

    Complete Kits are indicated by a K in their part number and include Camshaft, Lifters, Timing Chain & Gears, Valve Springs, Retainers, Locks, Assembly Lube, Decals, and Instructions.

    Small Kits are indicated by a SK in their part number and include Camshaft, Lifters, Timing Chain Set, Assembly Lube, Decals, and Instructions.

Unlock the full performance potential of your engine with Comp Cams Xtreme Energy Hydraulic Roller Camshafts—the go-to choice for street performance enthusiasts and weekend racers alike. Engineered for maximum power and throttle response, these camshafts combine aggressive lobe designs with modern valve timing to deliver enhanced horsepower across a wide RPM range.

Whether you're upgrading your street machine or building a high-performance project car, the Xtreme Energy series offers the perfect balance of drivability and power. Designed specifically for hydraulic roller setups, these camshafts increase airflow and cylinder efficiency—improving acceleration, torque, and overall engine output. If you're searching for a comp cam xtreme energy hydraulic roller, you'll find performance and quality that lives up to the name.

Each camshaft is designed with precision-ground profiles and tested for durability, ensuring reliable operation under high-performance conditions. Plus, competition camshafts specs are available to help you select the perfect cam based on your vehicle's specific setup, including gear ratios, compression, and intended use.

A hydraulic roller camshaft from Comp Cams is more than just an upgrade—it's a complete performance solution backed by decades of racing experience. From improved idle quality to snappy throttle response, this camshaft helps you get the most out of your build without compromising reliability.

Boost your engine's capability with the trusted innovation of Comp Cams. The Xtreme Energy Hydraulic Roller Camshaft is your ticket to serious street performance and dependable power.

For street or strip applications where you want instantaneous throttle response along with top-end horsepower, a hydraulic roller cam is a great part of a comprehensive package of engine mods to get you there. The Comp Cams Xtreme Energy series of hydraulic roller cams offers that kind of enhanced performance with an aggressive lobe profile and up to .050” lift, while still delivering the engine vacuum you need. 

Performance Benefits & Key Features

Comp Cams Xtreme Energy roller cams are designed for compatibility with the latest advances in valvetrain design; however, due to their aggressive design, it’s not advisable to pair your camshaft with stock valvetrain components. With their precision grind, Comp cams Xtreme Energy cams enhance acceleration, torque and overall engine performance by boosting airflow and cylinder efficiency. Unlike some performance-oriented cams that can start to lose vacuum at idle or low RPM, Xtreme Energy cams are designed for improved vacuum performance for power brakes and other accessories, enabling a longer duration phase. 

Fitment, Compatibility & Applications 

JEGS stocks Comp Cams Xtreme Energy camshafts for most small-block and big-block V8s from Chevrolet, Ford, Mopar and AMC. They’re a great way to optimize an engine build that also includes an aftermarket intake, carburetor, headers and ignition along with lower rear end ratios. Comp Cam packages are denoted with a “CL” for camshaft, lifters, assembly lube and instructions. Complete Kits will have a “K” that signifies cam, lifters, timing chain and gears, valve springs, retainers, locks, assembly lube, decals and instructions. The Small Kit will have an “SK” by the part number and will include cam, lifters, timing chain set, assembly lube, decals and instructions. Depending on your preferences and performance goals, Comp Cam lobe profiles range up to .580” lift and 294 degrees of duration, and some cams are rated up to 6500 rpm. 

Cams and kits that are designed for the strip and a high-RPM stall speed converter are also likely to have a rough and lopey idle, and will perform best when matched with the right intake and headers. As always, be sure of your vehicle’s year, make, model, trim level and engine size when ordering, and it’s advisable to do some research to find which intake, headers, carburetor and other details will be the best match with the camshaft you have in mind. All Comp Cams Xtreme Energy cams are backed by a 1 year warranty. 

Part TypeCamshaft
Product LineComp Cams 'Xtreme Energy' Hydraulic Roller Camshafts
BrandCOMP CAMS
Package Height3.0
Package Width3.0
Package Length24.5
Weight8.95 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)230
Cam StyleHydraulic roller tappet
Grind NumberCS XR276HR-10
Exh. Duration Advertised (Deg)282
Engine Make/SizeChevy Small Block (262-400)
Intake Valve Lift With Factory Rocker Arm Ratio (I0.502
Int. Duration @ .050 In. (Deg)224
Basic Operating Rpm Range1,900-5,600
Intake Valve Lift0.502 in (12.751 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 Ratio0.502 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 Number08-423-8
Package Qty1
Package TypeEA
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