COMP Cams 12-600-8 Thumpr Hydraulic Roller Camshaft Kit w/Redline Retro-Fit Lifters & Billet Timing Set for Chevy SBC 283 305 327 350 400 — Lopey Idle Street Cam 227/241 @.050" .511"/.497" 107° LSA

The Competition Cams 12-600-8 Thumpr Hydraulic Roller Camshaft Kit with Redline Performance Retro-Fit Lifters and Billet Double Roller Timing Set is built for one purpose — to make your small-block Chevy sound alive and hit harder than ever. Designed for Chevrolet 283, 305, 327, 350, and 400 engines, this all-in-one package transforms a mild street motor into a true muscle machine that sounds like it’s ready to dominate. At the heart of the kit is COMP’s famous Thumpr 12-600-8 hydraulic roller camshaft — a grind engineered for real-world performance and unmistakable attitude. With 227 degrees of intake duration and 241 degrees of exhaust duration at .050", lift numbers of .511" intake and .497" exhaust, and a tight 107-degree Lobe Separation Angle, this cam delivers the perfect balance of sound, torque, and driveability. The tighter LSA increases valve overlap for that signature “Thumpr” lopey idle — deep, rough, and impossible to ignore — while the duration and lift combination build serious cylinder pressure for explosive mid-range torque. Operating from 1,900 to 5,600 RPM, this cam is tailor-made for street-driven cars that want more bite. Throttle response is instant, torque hits early, and the power keeps coming all the way to redline. It’s the kind of setup that makes every stoplight feel like the starting line. The included Billet Double Roller Timing Set keeps that power precisely timed and synchronized. Its hardened billet steel sprockets and true roller chain eliminate timing stretch and deliver rock-solid accuracy, even under aggressive use. Pair that with Redline Performance Retro-Fit Link-Bar Hydraulic Roller Lifters, and you get modern roller reliability in older small-block Chevy engines. This setup is perfect for engines running 9.5:1 or higher compression with performance heads, free-flowing intake, and headers. It loves a mild converter (2,000+ stall) and rewards every upgrade with bigger gains. Whether it’s powering a Camaro, Chevelle, Nova, C10, or custom hot rod, the Thumpr combo gives your engine the sound and performance that turns a good build into a great one. You should buy this kit because it gives you everything that makes performance exciting — the sound that gets noticed, the torque that pins you to the seat, and the reliability that keeps you driving. It’s not just a camshaft — it’s a complete transformation. From the moment you fire it up, you’ll know why Thumpr cams are legendary.

• LIFETIME WARRANTY IF INSTALLED BY A CERTIFIED MACHINIST
• Full Performance Upgrade Kit – Includes COMP Cams 12-600-8 Thumpr hydraulic roller camshaft, Redline Performance Retro-Fit link-bar roller lifters, and a Billet Double Roller Timing Set for total power, precision, and sound.
• Aggressive Camshaft Specs That Deliver Results – 227° intake / 241° exhaust duration @ .050", .511" intake / .497" exhaust lift, and a tight 107° Lobe Separation Angle create the ideal combination of lopey idle, strong cylinder pressure, and explosive mid-range torque.
• Real Power You Can Feel – Operating range of 1,900–5,600 RPM produces instant throttle response, early torque, and strong pull through the entire powerband — perfect for performance street cars and weekend track builds.
• Aggressive Camshaft Specs That Deliver Results – 227° intake / 241° exhaust duration @ .050", .511" intake / .497" exhaust lift, and a tight 107° Lobe Separation Angle create the ideal combination of lopey idle, strong cylinder pressure, and explosive mid-range torque.
• The Signature Thumpr Sound – That deep, rough idle isn’t just noise — it’s attitude. The 107° LSA and aggressive overlap give your small-block Chevy the unmistakable Thumpr lope that announces power before you even hit the gas.
• Billet Double Roller Timing Set – Hardened billet steel sprockets and a precision roller chain maintain accurate cam timing under high RPM, delivering long-term durability and consistent power output.
• Built for Real Street Performance – Best with 9.5:1+ compression, aluminum heads, headers, performance intake, and a 2,000+ stall converter for the perfect balance of drivability and power.
• Why You Should Buy It – You’re not just buying a cam — you’re unlocking the sound, torque, and precision that define real American performance. This kit transforms your Chevy into a muscle machine that looks, sounds, and feels alive.