S&S CYCLE 124" Power Pack - 4.375" Stroke - Oil Cooled - Black w/Highlights - M8 - Harley-Davidson '17-'25 - 310-1058C

Big Bore Kit:

• 107" to 124" Big Bore Kit
• Wrinkle Black Finish with Fin Highlighting
• Bolt on kit. No case machining required
• 4.250" bore
• Forged Pistons
• 11:1 Compression Ratio

Oil Pump/Cam Plate:

• Precision machined from billet aluminum
• Passage plugs removable for servicing
• Independent scavenge sections for flywheel cavity and camchest
• Debris screens in both scavenge pickups
• Magnet in camchest to help to stop debris from entering oil pump
• 44% flow increase on supply side and 58% flow increase on scavenge side
• Pressure relief valve is adjustable with unit installed in engine
  
  Pushrods:
• Quickee pushrods
  
  Tappets:
• Hand assembled to exacting tolerances
• Reduced valve train noise from start up to shut down
• Close tolerances for low leak down rates
  
  Tappet Cuffs:
• Hard anodized black coating
• Billet aluminum construction
• Tappet stability in high lift and high rpm sitiuations
  
  Camshaft:
• S&S 550 camshaft - designed for big bore applications
  
  Valve Springs:
• Works well with camshafts up to 0.605" lift
• High performance conical single wire spring
• Includes top collars, keepers, valve seals and bottom collars

Fitment Guide

Specs