Performer RPM 454 Rectangle Port Cylinder Heads - Single - Complete BB Chevy, 118cc chambers, great torque and horsepower up to 6500 rpm

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