Edelbrock part 2171 Performer 351M400M intake manifold is designed for 400 c.i.d. Ford V8's produced from 1971 to 1982 with 2V Cleveland heads and 351M V8's produced from 1975 to 1982. Will not fit 1974 and earlier 351C V8's. Valley width measures 8 - 1732. Edelbrock's Patented Dual - plane, low - rise design with a 180 - degree firing order greatly improves torque over a wide rpm range for excellent throttle response from off - idle through 5500rpm. This Performer intake manifold is ideal for passenger cars, trucks, 4x4s, tow vehicles and RVs.