S&S MK Series Crankcase Assembly

Item: 420248-33829702

$2353.47

Select Your Vehicle - Fitment Guaranteed

S&S MK Series Crankcase Assembly


  • Stock deck height
  • Machined, close-fitting oil scraper (stock is as cast)
  • Large volume sump
  • Machined oil scraper allows for better oil scavenging which results in lower oil temperatures in the flywheel cavity
  • Can be paired with a S&S 136" cylinder kit and 4-5/8" stroker crank (sold separately)
  • Reinforced case prevents cracking in high stress areas for increased reliability
  • Allows for installation of larger bore kits, scrapes more oil, and offers reliability while fitting into stock Softail frame
  • Made in the USA
Specification Details
Country of Origin USA
Engine Type Milwaukee Eight
Warranty 1 Year Manufacturer Warranty

Vehicle Fitment


Fitment is guaranteed or your money back plus free return shipping.
Don’t waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.

Harley Davidson
  • FLDE Softail Deluxe 2018-2020
  • FLFB Softail Fat Boy 2018-2019, 2025
  • FLFBS Softail Fat Boy 114 2018-2024
  • FLHC Softail Heritage Classic 2018-2021, 2025
  • FLHCS Softail Heritage Classic 114 2018-2024
  • FLSB Softail Sport Glide 2018-2021
  • FLSL Softail Slim 2018-2021
  • FXBB Softail Street Bob 2018-2020, 2025
  • FXBBS Softail Street Bob 114 2021-2024
  • FXBR Softail Breakout 2018-2019, 2023-2025
  • FXBRS Softail Breakout 114 2018-2020
  • FXDR Softail 114 2019-2020
  • FXFB Softail Fat Bob 2018-2019
  • FXFBS Softail Fat Bob 114 2018-2023
  • FXLR Softail Low Rider 2018-2020
  • FXLRS Softail Low Rider S 2020-2025
  • FXLRST Softail Low Rider ST 2022-2025
  • FXST Softail Standard 2020-2024

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