Performer RPM 454 Rectangle Port Cylinder Heads - Single - Complete ED60559

BB Chevy, 118cc chambers, great torque and horsepower up to 6500 rpm

ED60559

60559

Performer RPM heads are perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. These heads give great torque and horsepower up to 6500 rpm. Designed for street/high-performance big-blocks operating from 2500-7000 rpm. Specially designed ports for increased flow and velocity over standard big-block 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. Combustion chamber volume: 118cc Intake runner volume: 315cc Exhaust runner volume: 110cc Intake valve diameter: 2.19" Exhaust valve diameter: 1.88" Valve stem diameter: 11/32" Valve guides: Manganese bronze In: USA Deck thickness: 9/16" Valve spring diameter: 1.55" Valve spring maximum lift: .700" Rocker stud: 7/16" Guide plate: Hardened Steel Pushrod diameter: 3/8" Valve Angle: 26° Exhaust port location: Stock Spark plug fitment: 14mm x 3/4" reach, gasket seat Made