Comp Cams  Xtreme Energy  Hydraulic Roller Camshafts
InfoVehicle Info Needed
COMP CAMSPART NUMBER: 249-CL35-421-8

Comp Cams Xtreme Energy Hydraulic Roller Camshafts

$86795
ShippingShips on 09/10/2026
Lowest PriceLowest Price Guarantee

Ford 351W 8 cyl. 1969-1996
  • For engines NOT originally equipped with a hydraulic roller camshaft.
    • Xtreme Energy XR270RF-HR Retro-Fit Hydraulic Roller Camshaft & Lifter Kit
      Lift: .513"/.513"
      Duration: 270°/276°
      Lobe Separation Angle: 110°
      RPM Range: 1500-5500

    • Produces Better Throttle Response
    • Produces Top Engine Horsepower
    • Delivers Increased Engine Vacuum
    • 1 Year Limited Warranty

      Ford, 351W, Windsor, 351 Windsor, 302, 5.0 HO, Explorer, Mutang, Ford Mustang, 408, 347, Fox Body Mustang, Fox Body, 302 HO, Cougar, F100, F150


      Good mid-range performance, 3.23+ gears, stock converter or 1800+ stall. Noticeable 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 Kit
    Product LineComp Cams 'Xtreme Energy' Hydraulic Roller Camshafts
    BrandCOMP CAMS
    Package Height3.2
    Package Width5.6
    Package Length25.4
    Weight13.55 PG
    Part CategoryPerformance Parts
    Exh. Duration @ .050 In. (Deg)224
    Cam StyleHydraulic roller tappet
    Grind NumberXR270RF-HR
    Exh. Duration Advertised (Deg)276
    Locks IncludedNo
    Engine Make/SizeFord 5.8L/351W
    Retainers IncludedNo
    Intake Valve Lift With Factory Rocker Arm Ratio (I0.513
    Int. Duration @ .050 In. (Deg)218
    Assembly Lubricant IncludedNo
    Basic Operating Rpm Range1,500-5,500
    Pushrods IncludedNo
    Gaskets IncludedNo
    Rocker Arms IncludedNo
    Intake Valve Lift0.513 in (13.03 mm)
    Computer-Controlled CompatibleNo
    Int. Duration Advertised (Deg)270
    Lobe Separation (Deg)110
    Rpm Range1500-5500
    Lifter StyleHydraulic roller
    Advertised Duration270 int./276 exh.
    Exhaust Valve Lift With Factory Rocker Arm Ratio (0.513
    Valve Springs IncludedNo
    UsageStreet/Performance
    Valve Lift With Factory Rocker Arm Ratio0.513 int./0.513 exh.
    QuantitySold as a kit
    Valve Stem Seals IncludedNo
    Exhaust Valve Lift0.513 in (13.03 mm)
    Advertised Intake Duration270
    Intake Duration At 050 Inch Lift218
    Exhaust Duration At 050 Inch Lift224
    Timing Chain And Gears IncludedNo
    Advertised Exhaust Duration276
    Lifter TypeHydraulic Roller
    Part FitmentSemi Universal
    Duration At 050 Inch Lift218 int./224 exh.
    Valve Springs RequiredYes
    Lifters IncludedYes
    Vendor Part NumberCL35-421-8
    Package Qty1
    Package TypeEA
    No Questions
    No Reviews

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