Power Package - 124" CI Oil Cooled, Gear Drive with Highlighted Fins and Black Pushrod tubes for 107" M8
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Power Package - 124" CI Oil Cooled, Gear Drive with Highlighted Fins and Black Pushrod tubes for 107" M8

Item #: 310-1058A
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Buy all of the matched parts in one kit and save $$$!

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
  • Blue Anodized Finish
  • Passage Plugs Removeable for servicing
  • Independant Scavenge Sections for Flywheel Cavity and Cam Chest
  • Debris Screens in both scavenge pickups
  • Magnet in Cam Chest to help to stop debris from entering oil pump
  • Increased Flow Capacity on both Feed and Scavenge side
  • Adjustable Pressure Relief Valve is adjustable with unit installed in engine


  • Quickee Pushrods
  • Gloss Black pushrod tubes


  • S&S Precision Tappets

Tappet Cuffs:

  • Hard Anodized Black Coating
  • Billet Aluminum Construction
  • Stronger than Stock Material eliminates Distortion
  • Improve tappet stability in high lift and high rpm situations


  • S&S 550 Cam- Designed for Big Bore Applications
  • 550G Gear Drive Cam
  • Gear Drive Kits provide improved cam timing accuracy and eliminate the stock cam chain tensioner
  • Gear Drive kits include outer Drive Gears

Valve Springs:

  • Work well with cams up to .605 lift
  • High Performance Conical Single Wire Spring


S&S does not recommend compression ratios higher than 10:1 for Tri Glide® or other three wheel models (including conversions) due to extra loads caused by the lugging nature of these bikes. Detonation and subsequent engine damage may result.

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Requirements: Harley-Davidson® M8 Head Bolts part # 10200303

Disclaimer NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLE. Not legal for sale or use on any EPA pollution controlled motor vehicle.