Pentium PortingIt's the 21st century, and some things still haven't changed. For instance, the majority of cylinder-head modifications are still carried out with a carbide cutter and sanding rolls in a performance machine shop. This manual operation is time consuming and a dirty job. About 10 years ago, with the advent of Computer Numeric Controlled (CNC) machinery and computer automation, some ingenious hot-rodder stuck a set of cylinder heads into a CNC machine, programmed a cutting table, and watched as this wondrous machine whittled away power-robbing sections of the cylinder head.
Power Heads has been successful with all kinds of Ford cylinder heads, both old and new. It can run its CNC program on vintage castings (or any Ford casting) to increase airflow and performance.
Power Heads' vintage 289 castings, like the ones we used, come fully assembled with performance valvesprings, 1.94-intake and 1.60-exhaust valves, hardened exhaust seats, and screw-in studs for an adjustable valvetrain. Basically, it's everything you want to do to your vintage cylinder heads for the rock-bottom price of $795 a pair. Power Heads set us up with its standard 289 cylinder head package, which included gasket-matching the ports and hand-blending the openings.