Speedmaster PCE281.2082.03 Features:

Assembly SpecificationsMax Lift: .600Coil Bind: .740Intake Install: 145 lbsExhaust Install: 145 lbsClosed Sear Pressure: 145 lbsOpen Seat Pressure: 360 lbsAs 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.

• Assembled with the finest premium components to provide your engine with optimal airflow for maximum engine performance
• Improved power throughout the rpm range for greater throttle response and top-end horsepower
• Coil Bind: .740
• Intake Install: 145 lbs.
• Exhaust Install: 145 lbs.
• Closed Sear Pressure: 145 lbs.
• Open Seat Pressure: 360 lbs.

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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