Free Shipping.

Expert Service.

Call 888-575-6570

KB Super-Duty Forged Pistons

Item: 391960

$176.59 – $376.73

Select Your Vehicle - Fitment Guaranteed

KB Super-Duty Forged Pistons


  • Anodized top ring groove and crown
  • Line-2-Line abradable skirt coating applied to .003" total thickness for a ZERO initial fit to allow coating to hone in for a tight quiet running clearance
  • Round wire locks
  • Premium Hastings 1.2mm 1.2mm 3.0mm Steel Nitride top ring with a Ductile Napier second
  • Forced wrist pin oiling
  • M8 version with flat top 1.2cc with compression height 1.083", valve pockets sized to accommodate 1mm oversize valves
  • Includes two pistons with rings, wrist pins, and circlips
Specification Details
Bore Varies (make selection above)
Compression Ratio Varies (make selection above)
Displacement Varies (make selection above)
Dome Volume Varies (make selection above)
Engine Type Varies (make selection above)
Material Aluminum
Piston Diameter Varies (make selection above)
Quantity 2
Size Over Standard Varies (make selection above)
Stroke Varies (make selection above)

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
  • FLD Dyna Switchback 2012-2016
  • FLDE Softail Deluxe 2018-2020
  • FLFB Softail Fat Boy 2018-2019
  • FLFBS Softail Fat Boy 114 2018-2024
  • FLHC Softail Heritage Classic 2018-2021
  • FLHCS Softail Heritage Classic 114 2018-2024
  • FLHR Road King 2007-2022
  • FLHRC Road King Classic 2007-2013
  • FLHRS Road King Custom 2007
  • FLHRXS Road King Special 2017-2024
  • FLHT Electra Glide Standard 2007-2009, 2019-2022
  • FLHTC Electra Glide Classic 2007-2013
  • FLHTCU Electra Glide Ultra Classic 2017-2019
  • FLHTCU Ultra Classic Electra Glide 2007-2016
  • FLHTCUL Electra Glide Ultra Classic Low 2015-2016
  • FLHTCUTG Tri Glide Ultra Classic 2009-2024
  • FLHTK Electra Glide Ultra Limited 2010-2024
  • FLHTKL Electra Glide Ultra Limited Low 2015-2019
  • FLHX Street Glide 2007-2024
  • FLHXS Street Glide Special 2014-2023
  • FLHXST Street Glide ST 2022-2023
  • FLHXXX Street Glide Trike 2010-2011
  • FLRT Freewheeler 2015-2024
  • FLS Softail Slim 2012-2017
  • FLSB Softail Sport Glide 2018-2021
  • FLSL Softail Slim 2018-2021
  • FLSS Softail Slim S 2016-2017
  • FLSTC Heritage Softail Classic 2007-2017
  • FLSTF Softail Fat Boy 2007-2017
  • FLSTFB Softail Fat Boy Lo 2010-2016
  • FLSTFBS Softail Fat Boy S 2016-2017
  • FLSTN Softail Deluxe 2007-2017
  • FLSTSB Softail Cross Bones 2008-2011
  • FLSTSC Softail Springer Classic 2007
  • FLTR Road Glide 2007-2009
  • FLTRK Road Glide Limited 2020-2024
  • FLTRT Road Glide 3 2023-2024
  • FLTRU Road Glide Ultra 2011-2013, 2016-2019
  • FLTRX Road Glide 2015-2024
  • FLTRX Road Glide Custom 2010-2013
  • FLTRXS Road Glide Special 2015-2023
  • FLTRXST Road Glide ST 2022-2023
  • FXBB Softail Street Bob 2018-2020
  • FXBBS Softail Street Bob 114 2021-2024
  • FXBR Softail Breakout 2018-2019, 2023-2024
  • FXBRS Softail Breakout 114 2018-2020
  • FXCW Softail Rocker 2008-2009
  • FXCWC Softail Rocker C 2008-2011
  • FXD Dyna Super Glide 2007-2010
  • FXDB Dyna Street Bob 2007-2017
  • FXDBC Dyna Street Bob Limited 2016
  • FXDBP Dyna Street Bob 2016
  • FXDC Dyna Super Glide Custom 2007-2014
  • FXDF Dyna Fat Bob 2008-2017
  • FXDL Dyna Low Rider 2007-2009, 2014-2017
  • FXDLS Dyna Low Rider S 2016-2017
  • FXDR Softail 114 2019-2020
  • FXDWG Dyna Wide Glide 2007-2008, 2010-2017
  • FXFB Softail Fat Bob 2018-2019
  • FXFBS Softail Fat Bob 114 2018-2023
  • FXLR Softail Low Rider 2018-2020
  • FXLRS Softail Low Rider S 2020-2024
  • FXLRST Softail Low Rider ST 2022-2024
  • FXS Softail Blackline 2011-2013
  • FXSB Softail Breakout 2013-2017
  • FXST Softail Standard 2007-2009, 2020-2024
  • FXSTB Softail Night Train 2007-2009
  • FXSTC Softail Custom 2007-2010
  • FXSTD Softail Deuce 2007

Customer Reviews

Write Review

Be the first to review this product. How many stars would you give this product?

Questions & Answers

Ask Question

Have a question? Please ask our experts and customers who own this product.