Rectangular Port Aluminum Cylinder Heads

These Chevrolet Performance oval port aluminum cylinder heads are fully machined with semi-finished bronze alloy guides and valve seats that use 2.25 in. intake and 1.88 in. exhaust valves. They feature high-velocity 315cc intake runners to enhance midrange throttle response and torque. The valve spring diameter is 1.550 in. with 7/16 in. rocker stud holes. The heads will accept all stock accessory brackets.