The Edelbrock Performer RPM camshaft kits are designed for high-performance street applications. These hydraulic lifter camshafts are dyno-matched to Edelbrock's Performer line of intake manifolds to provide increased horsepower and optimum torque from the low-end to the mid-range. The intake valve lift with factory rocker arm ratio is 0. 448 and exhaust valve lift is 0. 510. Headers, high energy ignition systems, lower than stock rear end gearing and a high performance torque converter in automatic transmission equipped vehicles are necessary to gain all of the performance in these camshaft kits.