Rocker Arm Comparison Test - Design Matters

This chart represents a portion of the dyno pulls of the aluminum rockers and the shaft-mount rockers. It plots horsepower between peak power at 6,000 rpm and 6,500 rpm, when the test ended. Many racers don't pay attention to power on the backside of the curve, but it is important because you want to use your highest power rpm range, and that normally involves rpm on both sides of peak power. Although the aluminum rockers produced better peak numbers, the shaft-mount rocker system exhibited better high-rpm valve control and allowed the engine to maintain better power after peak.

Here are the results from our testing. Note that there are numbers included for the High Energy rockers, but they only go to 5,000 rpm. There are no numbers for the Magnum rockers. The High Energy numbers were from a run executed before we determined peak rpm. The Magnum rockers showed signs of damage before we could get a good dyno pull. Peak numbers on the chart are bold, and the "Average" is the average power numbers from 4,000 to 6,000 rpm. This is designed to simulate the rpm range this engine would see on the racetrack.