Edelbrock’s new RPM Xtreme cylinder heads for small-block Fords, part number 51259, are CNC ported for maximum air flow and ultimate performance.
Engineered and manufactured using the best combination of as-cast port design and CNC technology, the RPM Xtreme heads are CNC ported in critical areas (combustion chambers, intake entry, exhaust exit, and intake/exhaust bowls) for improved air flow and overall performance.
Ideal for high-performance street and entry-level race applications, the heads are sold complete with high-quality conical (beehive) springs, 8mm stem stainless steel valves, and heli-coil inserts in the exhaust flange and rocker stud bosses.