Edelbrock Cylinder Head, 60555, Performer RPM Big-Block Chevy Rectangular Port Hydraulic Roller Cam

The Edelbrock #60555 Performer RPM Rectangle Port cylinder head is designed for Big-Block Chevy applications. The Edelbrock #60555 Performer RPM head is perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. This cylinder head delivers great throttle response and power from 2500 to 7000 rpm. They also feature the highest quality intake and exhaust valves and valve springs. For use on pre-pollution controlled vehicles only.

All Performer and Performer RPM Big-Block Chevrolet heads have spark plugs relocated closer to center of bore which will interfere with high-dome pistons for open chamber heads.

Use pistons designed for our heads

Deck thickness: 9/16", pushrod diameter: 7/16"

Replacement valve part numbers are for sets of 8

Deck thickness: 9/16", rocker stud diameter: 7/16", pushrod diameter: 3/8" (width of slot in guide-plate)

Bare heads have valve guides and seats installed but require final sizing and a valve job to match the valves you purchase