MK136 Black Edition 49-State Engine for Oil-Cooled 2017-2023 M8 Touring
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MK136 Black Edition 49-State Engine for Oil-Cooled 2017-2023 M8 Touring

Item #: 310-1290
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Cylinder Heads

  • High-flow cylinder heads with premium seats, guides, valves, springs, and seals
  • +1mm oversized intake and exhaust valves
  • Valves are .030" longer than stock for improved valvetrain geometry
  • .605" max lift valve springs
  • High-strength alloy used in cylinder head casting, improved strength at high temperatures
  • Enlarged cooling passage around the exhaust seats
  • S&S Exclusive breather boxes


  • All premium quality components
  • Patented Dual-Spray Piston Cooling Jets 
  • Precision machined oil scraper
  • Enlarged oil sump
  • Contoured floor allows oil to easily drain back to the sump


  • Forged pistons
  • S&S performance oil pump and cam support plate
  • Premium tappets and tappet cuffs
  • Billet aluminum covers
  • Sprocket shaft spacer included
  • Champion spark plugs
  • Retains stock engine height
  • Includes Cam Cover Badge
  • Powder coat finish matches factory finish
  • Huge displacement increase means a huge power increase  

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Disclaimer DISCLAIMER: NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLE *Qualified Manufacturer Declared 49-State Federal Emissions Compliant Engine in MY 2017-2020 touring models
This product can expose you to chemicals, including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm.
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