Engine Cylinder Head - PCE281.2146

Assembly Specifications Max Lift: .600 Coil Bind: .1.060 Intake Install: 145lbs @ 1.9 Exhaust Install: 145lbs @ 1.9 Closed Sear Pressure: 145lbs Open Seat Pressure: 360lbs As with all Speedmaster cylinder heads, our Small Block Chrysler heads are Gravity Die Cast . This casting process creates a much more uniform and robust cylinder head. With the increasingly large displacements becoming common, the need for more airflow is necessary. If you are looking to build a 400-500+hp engine, give our PCE281.1654 heads a try. They offer a smaller cross - section to increase the incoming air s velocity, resulting in great driveability, power and economy. On engines over 500hp, use the CNC Ported PCE281.1656 heads. The mid-size cross section works well on larger displacement engines and in and under 7000RPM. If you re looking for more horsepower the PCE281.1658 with their competition valve job fit the bill perfectly.