Designed for 1986 and earlier 262-400 cubic inch Chevys. This small-block Chevy manifold has an all-new runner design that's "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 of 5 hp and 9 ft/lbs of torque over the Edelbrock Performer manifold EDE2101.