This Performer is designed for 1968-76 Cadillac 472 and 500ci engines. For either square- or spread-bore carbs, This is the first intake designed specifically for high-performance Cadillacs using standard heads. Like all Edelbrock Performers, this manifold increases torque and horsepower from idle to 5500 rpm. The broad power band is ideal for high-performance street and engine swap applications. Specs on this non-EGR manifold include a carb pad height that's 3' taller than stock. Dropped divider wall evens air/fuel ratio throughout the rpm range. Stock air conditioning compressor will not fit.