Upgrade your Big Block Chevy with a set of Speedmaster Cylinder Heads
As with all Speedmaster cylinder heads, their Big Block Chevy 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 the Speedmaster PCE281.1489 heads a try. They offer a smaller cross section to increase the incoming air 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 540ci and under 7,000 RPM. 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.
