The Competition Cams 54-703-11 Stage 2 Thumpr hydraulic roller camshaft brings serious power gains and the unmistakable Thumpr attitude to GM LS Gen III/IV engines (1997–2015). With .614" intake / .612" exhaust lift, this cam opens the valves dramatically farther than stock, allowing your LS to pull in more air and push out exhaust with greater efficiency. That increased airflow boosts throttle response, torque, and overall engine intensity the moment you hit the gas.

With 227° intake / 237° exhaust duration @ .050", the valves stay open long enough for excellent cylinder filling and exhaust scavenging. This produces a stronger mid-range, better throttle response, and a livelier, more powerful feel across the RPM band. Whether towing, daily driving, or making spirited runs, your LS will feel more eager and aggressive.

The 113° lobe separation angle (LSA) creates the classic Thumpr idle — deep, choppy, and attention-grabbing — while still keeping the engine manageable for street use once properly tuned. You get a muscle-car sound that announces your build with authority and adds unmistakable character to your vehicle.

If your LS build includes bolt-ons like headers, upgraded exhaust, intake or tuning, this cam ties everything together. The 54-703-11 transforms your LS into a more responsive, more powerful, and far more exciting engine, with the signature Thumpr sound and feel enthusiasts love.