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        "CNC Aluminum Cylinder HeadBig Block Chevy 454 w/Solid Roller CamAssembled Head125cc Combustion Chamber360cc Intake RunnerIncludes Valves & SpringsSet of 2 Special Note: Camshaft and Lifters Not Included Assembly Specifications<br/><br/> Max Lift: .650<br/> Coil Bind: .925<br/> Intake Install: 275lbs @ 2.1<br/> Exhaust Install: 275lbs @ 2.1<br/> Closed Sear Pressure: 210lbs<br/> Open Seat Pressure: 450lbs<br><br/><br/> As with all Speedmaster cylinder heads, our Big Block Chevrolet 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 PCE281.1489 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 rectangle port PCE281.1488 heads. The mid-size cross section works well on engines under 540cu.in and under 7000RPM. If you are working on a larger, or higher RPM engine, step up to the CNC ported PCE281.1511 heads. The added volume of the PCE281."
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