RPM Big-Block Chevy Retangular Port Cylinder Head Hydraulic Roller Cam

The Edelbrock #60555 Performer RPM Rectangle Port cylinder heads are designed for Big-Block Chevy applications. The Edelbrock #60555 Performer RPM heads are perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. These cylinder heads deliver 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.

INSTALLATION NOTE:
• EQUIPPED WITH SPRINGS FOR USE IN HYDRAULIC ROLLER CAMSHAFT APPLICATIONS
• Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat.
• All Performer and Performer RPM Big-Block Chevy heads: Spark plug is closer to center of bore, will interfere with high-dome pistons for open chamber heads.
• Use pistons designed for our heads. Match with Edelbrock head gasket sets.
• Designed for street/high-performance big-blocks operating from 2500-7000 rpm
• Specially designed ports for increased flow and velocity over standard big-block cylinder heads
• Highly-efficient 118cc open-style combustion chamber
• High-velocity 315cc long/300cc short intake ports
• Smaller-than-stock 11/32" valve stems promote excellent flow and lighter valve weight