Engine - Cylinder Heads - Signature Series Aluminum Oval Port Cylinder Head

From GM Performance - These oval port cylinder head will fit all 1965-96 Mark IV and Gen V or VI 396-502 cubic inch big block Chevrolet engines. They are fully machined with semi-finished Bronze Alloy guides and semi-finished valve seats that use 2.19/1.88 inch valves. These high velocity 290cc intake runners enhance mid range throttle response and torque.