-18X Series Cylinder Heads
  • 68cc Combustion Chambers
  • Standard Exhaust Ports

  • STS -18X Series Cylinder Heads
  • 68cc Combustion Chambers
  • Standard Exhaust Ports
  • 100% CNC Ported

  • STS -18X Series Cylinder Heads
  • 68cc Combustion Chambers
  • Spread Exhaust Ports
  • 100% CNC Ported