The Edelbrock part #79259 Small Block Ford E-CNC 185 cylinder head is the ultimate in performance. This cylinder head is fully CNC ported for maximum horsepower and torque making them ideal for high-performance's street and light duty racing applications. They also feature high-quality lightweight valve springs and heavy duty hardware for maximum lift and maintain the stock exhaust port location. E-CNC 185 FORD FEATURES: - CNC ported to achieve optimal air-flow for maximum horsepower and torque in high Performance's street and light duty racing applications - The casting and port designs are all new and engineered for great performance - Fully CNC'd intake ports combustion chambers and exhaust ports for improved air-flow - Head feature 2.02" intake and 1.57" exhaust 8mm stem valves and are equipped with conical valve springs and steel retainers for a lightweight and durable valve train combo - Aggressive 18deg valve angle for maximum performance and accepts common intake manifolds such as Edelbrock Performer RPM and RPM II - Equipped with valve springs for use in hydraulic roller applications - Combustion chamber size of 59cc - Maximum lift: .600"