Engine - Cylinder Heads - Signature Series Aluminum Rectangle cylinder Head

From GM Performance - This cylinder head fits all 1965-1996 Mark IV and Gen V and 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 315cc long intake runner and 300cc short runners enhance mid-range throttle response and torque. The exhaust runner volume is 100cc.