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S&S 128" Power Package with Gear Drive Cams

Item: 395007

$2960.96 – $3023.96

Select Your Vehicle - Fitment Guaranteed

S&S 128" Power Package with Gear Drive Cams

The 128" Power Package is the ideal combination of performance and savings to transform your Milwaukee Eight HD without breaking the bank. Bumps that engine from 114ci to 128ci as well as adding matched cams/cam plate/oil pump and everything else a high performance cam chest needs to reliably make big power.

Big Bore Kit

  • 114" to 128" big bore kit
  • Aluminum construction cylinders
  • No case machining required
  • 4.250" bore
  • Forged pistons
  • 11.1:1 compression ratio


  • S&S 550 gear drive camshaft
  • Designed for big bore applications

Oil Pump/Cam Plate

  • Precision machined from billet aluminum
  • Blue anodized finish
  • Passage plugs removable for servicing
  • Independent 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 with chrome 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

Valve Springs

  • Work well with cams up to .605 lift
  • High-performance conical single wire springs
  • Includes all gaskets, bearings, and hardware required for installation
  • Made in the USA

Product Note: Only fits stock 114 cubic inch engines.

Specification Details
Bore 4-1/4 in.
Compression Ratio 11.1:1
Country of Origin USA
Displacement 128CI
Drive Type Gear Drive
Engine Type Milwaukee Eight
Exhaust Duration 273.1 degrees front/277.8 degrees rear
Exhaust Lift .232 in. front/.264 in. rear
Exhaust Lobe Center 106 degrees front/100.5 degrees rear
Exhaust Timing (Close) 30.5 degrees front/38.4 degrees rear
Exhaust Timing (Open) 62.5 degrees front/59.4 degrees rear
Finish Varies (make selection above)
Intake Duration 218.9 degrees front/214.2 degrees rear
Intake Lift .127 in. front/.099 in. rear
Intake Lobe Center 100 degrees front/104 degrees rear
Intake Timing (Close) 29.4 degrees front/31.1 degrees rear
Intake Timing (Open) 9.4 degrees front/3.1 degrees rear
Valve Lift .550 in.

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
  • FLFBS Softail Fat Boy 114 2018-2019
  • FLHCS Softail Heritage Classic 114 2018-2024
  • FLHTCUTG Tri Glide Ultra Classic 2019-2024
  • FLHTK Electra Glide Ultra Limited 2019-2023
  • FLHTKL Electra Glide Ultra Limited Low 2019
  • FLTRK Road Glide Limited 2020-2023
  • FLTRU Road Glide Ultra 2019
  • FXBRS Softail Breakout 114 2018-2020
  • FXDR Softail 114 2019-2020
  • FXFBS Softail Fat Bob 114 2018-2023

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