Now available for Small Block Chevy with Vortec or Edelbrock E-Tec cylinder heads, the Performer EPS dual-plane manifold is optimized to deliver superior performance with Edelbrock square-bore Performer Series or Thunder Series AVS carburetors. The runner design is ''tuned'' for peak torque around 3500 rpm on a 350-inch engine and it's ideal for power from off-idle to 5500 rpm. Dyno tests showed gains averaging 5+ ft/lbs. of torque from 3000 to 4500 rpm for more performance where your need it most. Match with a dependable Edelbrock square-bore carburetor for maximum performance gains.