Genuine COMP CAM 12-242-2 XE268H Xtreme Energy 224/230 Kit | Performance Lifters | True Double Roller Timing | Z28 Style HP Springs | Push Rods | FITS Chevrolet SBC 283 327 350 400 5.7 5.7L

Upgrade your engine with the most popular street performance camshaft on the market: the Competition Cams 12-242-2 Xtreme Energy (XE268H). If you drive your Small Block Chevy (265-400ci) on the street but want serious power when you mash the throttle, this is the cam you need. Unlike older, lazy cam profiles, the Xtreme Energy series is engineered with aggressive, fast-opening lobe profiles. This technology opens the valves quicker and keeps them open longer, delivering massive increases in throttle response and torque without sacrificing engine vacuum or daily drivability. Let’s look at the specs that make the XE268H a legend. It features a Duration @ .050 of 224 intake and 230 exhaust, with a valve lift of .477”/.480”. This geometry is perfectly tuned for the 1,600 to 5,800 RPM range. This means you get strong off-the-line power that transitions seamlessly into a hard-pulling mid-range and top end. Whether you are cruising in a heavy Chevelle or ripping through gears in a lightweight Camaro, this cam provides the "area under the curve" power that makes a street car feel fast in every gear. How does it drive? It is the definition of a "responsive" engine. The fast ramp rates give you an instant snap when you touch the gas. The 110-degree Lobe Separation Angle (LSA) provides a distinct, slightly lopey idle that sounds healthy and muscular, but it maintains enough vacuum to run power brakes and accessories without issue. It is the "Goldilocks" cam—aggressive enough to turn heads and win stoplight races, but civilized enough to drive to work. Why buy the Competition Cams 12-242-2? Because efficiency equals power. Competition Cams designed this grind to maximize the airflow of modern cylinder heads and intake manifolds. It works exceptionally well with stock torque converters in 350+ cubic inch engines (though a 1,800-2,000 stall is recommended for maximum performance). Don't settle for 50-year-old cam technology. Install the Xtreme Energy XE268H and experience the sharpest throttle response and broadest power curve available for your classic Chevy.

• Xtreme Energy Technology (Fast Ramps): This cam utilizes Competition Cams' famous "XE" profiles, which open and close the valves faster than standard cams. Why Buy It: This creates more "area under the lift curve," giving you significantly more throttle response and horsepower than other cams with similar duration specs.
• Perfect Street Specs (224/230 Duration): With a Duration @ .050 of 224 Int / 230 Exh, this cam dominates the 1,600-5,800 RPM band. Why Buy It: It is the ultimate "Do-It-All" street cam, offering great low-end torque for cruising and explosive mid-range power for passing or racing.
• 1)AUTHENTIC COMP CAM 12-242-2 XTREME ENERGY 224/230 HYDRAULIC CAMSHAFT - Great for street machines. Largest cam for stock converter, but better with a 2000+ stall.
• 16) ENGINETECH HIGH-PERFORMANCE HYDRAULIC LIFTERS
• 1) TRUE DOUBLE ROLLER TIMING SET - 3 key crank sprocket. 4 degree crank offset.
• 16) ENGINETECH HIGH-PERFORMANCE SPRINGS - 2.023" Free Ht. W/damper. 1.260" OD. 118 lbs closed @ 1.700", 318 lbs open @ 1.210". Coil bind at 1.160".
• 16) PUSH RODS - 7.794" Length
• 16) HARDENED STEEL VALVE SPRING RETAINERS & LOCKS
• Optimized Lift (.477”/.480”): The lift is precision-ground to .477” Intake and .480” Exhaust. Why Buy It: This lift is safe for most stock rocker arms and pushrods but high enough to take full advantage of aftermarket intake manifolds and headers for maximum breathing.
• Muscular Idle with Vacuum (110 LSA): The 110-degree Lobe Separation Angle creates a noticeable, performance idle tone. Why Buy It: You get the "Hot Rod" sound you want, but it still produces sufficient vacuum to operate your power brakes safely, making it superior to race cams for street use.