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Revolution Performance Sportster, XB and XR1200 Monster Cylinder Head Package

(For XL1200 and Thunderstorm Sportster, XB and XR1200 style motorcycles)


The Revolution Performance Monster CNC Monster Head Package has big ports, big valves, and flow big numbers. Monster heads are designed only to work with our largest displacement engine packages. Developed on the flow bench, dyno, and the street for Sportster, XB and XR1200 engines with XL1200 and Thunderstorm style heads". The Monster CNC package has been painstakingly developed on the flow bench, dyno and street for maximum power, ride-ablity. The ports are machined with laser accuracy on our state of the art Centroid A560 5-Axis and then hand blended. CNC Machine Center. We install new guides and seats. The seats are CNC machined on our Newen BB Contour Turning Center. The combustion chamber is polished and the gasket surface decked for optimal combustion chamber volume. New 1.900” intake and 1.615" exhaust valves are installed with .675 max lift valve springs for XL1200 and Thunderstorm heads. The head is shipped ready to install.

    Included in each monster package:

  • CNC port work
  • New 1.900" intake valves
  • New 1.615" exhaust valves
  • New .600 max lift springs
  • (CNC valve job 1991-2003, new seats and guides / 2004 & Later CNC valve job with new guides
  • New valve guide seals

Recommended Products:

  • Sportster, XB and XR1200 Big Bore Kits

  • For questions on our cylinder head packages, please contact our sales technicians directly at: 1-866-892-2109 M-F 8:30 A.M. - 5:00 P.M. CST.

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