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Bill's Exhausts

S&S CYCLE Power Pack - 4.375" Stroke - Oil Cooled - Black w/Highlights - M8 310-1056C

S&S CYCLE Power Pack - 4.375" Stroke - Oil Cooled - Black w/Highlights - M8 310-1056C

$3,294.95 USD
$3,265.95 USD $3,294.95 USD
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Shipping calculated at checkout.
  • Bolt-on kit
  • No case machining required
  • Forged pistons
  • Made in the USA
  • Includes oil pump/cam plate, pushrods, tappets, tappet cuffs, 550 camshaft, valve springs
  • 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

    Fitments

    2025 Harley-Davidson Softail Fat Boy FLFB - -
    2025 Harley-Davidson Softail Low Rider S FXLRS - -
    2025 Harley-Davidson Softail Low Rider ST FXLRST - -
    2025 Harley-Davidson Street Glide EFI FLHX - -
    2025 Harley-Davidson Road Glide Custom FLTRX - -
    2025 Harley-Davidson Softail Heritage Classic FLHC - -
    2025 Harley-Davidson Softail Breakout FXBR - -
    2024-2025 Harley-Davidson Road Glide Police FLTRXP - -
    2024 Harley-Davidson FLI Hydra-Glide Revival - -
    2023-2024 Harley-Davidson FXBR Breakout 117 - -
    2023 Harley-Davidson FLHFB Electra Glide Highway King - -
    2022-2025 Harley-Davidson FXLRST Low Rider ST 117 - -
    2022-2024 Harley-Davidson FXLRS Low Rider S 117 - -
    2022-2023 Harley-Davidson FLHXST Street Glide ST - -
    2022-2023 Harley-Davidson FLTRXST Road Glide ST - -
    2022, 2025 Harley-Davidson Softail Street Bob FXBB - -
    2022 Harley-Davidson FXRST Low Rider El Diablo 117 - -
    2021-2024 Harley-Davidson FXBBS Street Bob 114 - -
    2021 Harley-Davidson FLH Electra Glide Revival - -
    2020-2024 Harley-Davidson FXST Softail Standard 107 - -
    2020-2021 Harley-Davidson FXLRS Low Rider S 114 - -
    2019-2022 Harley-Davidson FLHT Electra Glide Standard - -
    2019-2020 Harley-Davidson FXDRS FXDR 114 - -
    2018-2024 Harley-Davidson FLHCS Heritage Classic 114 - -
    2018-2024 Harley-Davidson FLFBS Fat Boy 114 - -
    2018-2021, 2023 Harley-Davidson FXFBS Fat Bob 114 - -
    2018-2021 Harley-Davidson FLHC Heritage Classic 107 - -
    2018-2021 Harley-Davidson FLSB Sport Glide 107 - -
    2018-2021 Harley-Davidson FLSL Softail Slim 107 - -
    2018-2020 Harley-Davidson FXBB Street Bob 107 - -
    2018-2020 Harley-Davidson FXLR Low Rider 107 - -
    2018-2020 Harley-Davidson FLDE Deluxe 107 - -
    2018-2020 Harley-Davidson FXBRS Breakout 114 - -
    2018-2019 Harley-Davidson FXFB Fat Bob 107 - -
    2018-2019 Harley-Davidson FLFB Fat Boy 107 - -
    2018-2019 Harley-Davidson FXBR Breakout 107 - -
    2017-2025 Harley-Davidson FLHRXS Road King Special - -
    2017-2025 Harley-Davidson FLHX Street Glide - -
    2017-2025 Harley-Davidson FLTRX Road Glide - -
    2017-2025 Harley-Davidson Electra Glide Police FLHTPI - -
    2017-2025 Harley-Davidson Road King Police FLHP - -
    2017-2023 Harley-Davidson FLHXS Street Glide Special - -
    2017-2023 Harley-Davidson FLTRXS Road Glide Special - -
    2017-2022 Harley-Davidson FLHR Road King - -
    2017-2022 Harley-Davidson FLHXSE CVO Street Glide - -

    Fitment Disclosure

    This quick reference fitment information is provided to direct you to our catalog information and the manufacturer's information. Consult manufacturer publication(s) and/or website(s) for specific fitment and application information and other important information. This fitment information is based upon the stock version of the motorcycle or unit referenced and any accessory added or other modification could invalidate the quick reference information provided.
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