• Performer RPM
• Cylinder Head
• Single
• Chamber Size 118cc
• Complete
• 454-R
Big Block
• Sold Individually

FEATURES:

• Springs for hydraulic flat tappet camshaft
• 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

Cylinder Head Specifications:

• 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
• Deck thickness: 9/16"
• Valve spring diameter: 1.55"
• Valve spring maximum lift: .700"
• Rocker stud: 7/16"
• Guideplate: Hardened steel
• Pushrod diameter: 3/8"
• Valve angle: 26 degree
• Exhaust port location: Stock
• Spark plug fitment: 14mm x 3/4 reach