New Edelbrock Performer small block chevy 1955-1986 262-400 cid intake manifolds are low-rise, dual-plane designs with patented runner tuning and a 180 degree firing order that you won’t find with the competition. This combination boosts torque over a wide rpm range, from idle to 5,500 rpm. These manifolds also deliver improved throttle response over stock intakes and is 4 bbl spread bore carb flange (non EGR).Satin finish with exit port dimensions 1.14″x 1.88″.