Speedmaster PCE281.1489 305cc 119cc Alu. Bare Cyl Head for Chevy BBC 396

Chevy BBC 396 305cc 119cc Aluminum Bare Cylinder Head 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 PCE281.1511 intake ports (360cc) helps to fill in the gap between As-Cast performance heads and All-Out racing heads. If you"re looking for 750+hp the PCE281.1523 with their competition valve job fit the bill perfectly. Great throttle response and top-end horsepower Highly efficient ports and state-of-the-art combustion chambers shapes for improved performance throughout the rpm range