COMP CAM 12-250-3 Xtreme Energy 240/246 XE284H Camshaft Kit | .507"/.510" | Performance Lifters | Double Roller Timing | FITS Chevy SBC 327 350 400 5.7 5.7L | Rough Idle | ++ Power & Torque

This kit for the Chevy Small Block is built around the high-performance Competition Cams 12-250-3 (XE284H). This package combines the most aggressive street-strip profile in the Xtreme Energy series with a True Double Roller Timing Set and Redline High-Performance Lifters for a rock-solid, high-revving valvetrain. Product Description The Xtreme Energy Advantage The Competition Cams 12-250-3 is the pinnacle of the Xtreme Energy series for street-strip applications. Utilizing advanced fast-ramp technology, this cam snaps the valves open quickly to build massive "area under the lift curve." This results in significantly better throttle response and more top-end power than traditional lazy-lobe cams. You should buy this kit to give your Chevy the absolute maximum performance possible from a hydraulic flat-tappet setup while still maintaining the vacuum needed for power brakes. Rock-Solid Timing Accuracy To ensure your engine’s power remains consistent under the stress of high-RPM pulls, this kit includes a True Double Roller Timing Set. Standard single-row chains are prone to stretching, which causes "timing drift" and robs you of torque and horsepower. This heavy-duty double-row design is 3x stronger than stock, keeping your camshaft and crankshaft in perfect synchronization. This is critical for high-output builds to ensure your ignition timing stays exact throughout the entire power band. Aggressive Power Band and Feel This is a high-performance cam engineered for a serious power band of 2,300–6,400 RPM. On the road, this cam feels "electric"—once you cross the 2,500 RPM mark, the engine undergoes a violent transformation, pulling with increasing intensity all the way to the redline. It is the perfect choice for vehicles with a 2,800+ stall converter and performance rear-end gears. You should buy this to make your car feel hundreds of pounds lighter through sheer acceleration. Superior Valvetrain Integrity To handle the high-revving demands and aggressive ramp speeds of the XE284H, this kit includes Premium Redline High-Performance Lifters. These lifters are manufactured with advanced metallurgy to withstand the mechanical stress of high-lift lobes. Featuring precision-ground faces and specialized oiling ports, they ensure a constant film of lubrication—the most critical factor for a successful break-in and long-term durability in a high-output Small Block build.

• COMPETITION CAMS XE284H ACCURATE SPECS: Features the 12-250-3 grind with 284°/296° Advertised Duration, 240°/246° Duration @ .050", and a massive .507"/.510" Valve Lift. You should buy this for the industry-leading ramp speeds that maximize air intake.
• TRUE DOUBLE ROLLER TIMING SET: Includes a high-strength double-row chain and heat-treated gears that are 3x stronger than stock, preventing chain stretch and ensuring exact ignition timing for maximum power.
• THE "XTREME" FEEL - VIOLENT TOP-END SURGE: You should buy this cam for the feeling of endless top-end horsepower; it is designed to keep pulling long after other street cams have "laid down" and stopped making power.
• RADICAL PERFORMANCE IDLE: Ground with a 110° Lobe Separation Angle, this cam delivers a rough, radical, and unmistakable lope at idle. You should buy this if you want your Chevy to sound like a dominant street-strip machine.
• FAST-RAMP LOBE TECHNOLOGY: Engineered to get the valves to peak lift almost instantly, maximizing volumetric efficiency and providing the "snappy" throttle response usually reserved for racing engines.
• DUAL-PATTERN BREATHING: Features extra duration on the exhaust side to help high-revving Small Blocks scavenge exhaust gases more effectively, maximizing the performance of your headers and exhaust system.
• PREMIUM REDLINE LIFTERS: Full set of hydraulic flat-tappet lifters with precision-machined faces specifically designed to follow the fast-action lobes of the high-lift Xtreme Energy series.
• SMALL BLOCK COMPATIBILITY: Precision-tailored for 1967–1995 262, 265, 267, 283, 302, 305, 307, 327, 350, and 400 cubic inch engines (Non-Roller).