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S&S Top End Guardian Kit

(2 reviews)

Item: 394294

$809.96

Select Your Vehicle - Fitment Guaranteed

S&S Top End Guardian Kit


If you're building an M8 for big power, these are the parts you need to bulletproof the top end of your valvetrain in one convenient kit. S&S performance parts are direct replacement for OEM pieces, but are stronger and more durable, giving your M8 the reliability it needs as you build big HP and torque numbers. Rocker arm shafts, rocker arm studs, head bolts and performance roller rocker arms are included in this kit that is the perfect topper for your high performance M8 build.

  • Complete kit with installation instructions
  • Made in the USA

Rocker Arm Shafts

  • Replace broken or worn OEM pieces with stronger, more durable S&S performance parts
  • Direct replacement for stock parts
  • Hardened and surface ground for ultimate precision and durability

Rocker Arm Stud Kit

  • Extend the life of your cylinder heads
  • Prevent damage to rocker arm rowers
  • Install studs and safely re-torque nuts
  • Black oxide finish
  • 12-point nuts

Head Bolt Kit

  • Heat-treated 8640 steel
  • 200,000 PSI tensile strength
  • 14% increases in strength over stock
  • Stronger material than stock head bolts
  • Durable black oxide coating
  • 9/16" 12 point head with integral washer
  • Formed threads
  • Cold formed head
  • Reusable

Forged Roller Rocker Arms

  • Forged from 8620 steel for greater strength
  • Designed using Finite Element Analysis (FEA)
  • Rollers eliminate thrusting on valves for decreased wear on the valve train
  • Rocker geometry is better suited to high lift cams
  • Bushings are 50% longer than stock, increasing time between rebuilds
  • Larger surface area on the thrust surfaces reduces wear on the heads
  • Oil is sprayed directly on the valve springs:
    • Reduce potential for breaking a valve due to over-heating (stock rockers tend to oil the rocker boxes, not the valves)
  • Compatible with stock or S&S CNC heads
  • 1.640 Ratio
  • Capable of .650" max Valve Lift
  • Serviceable and rebuildable for generations of durabilty
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
  • FLFBS Softail Fat Boy 114 2018-2024
  • FLHC Softail Heritage Classic 2018-2021
  • FLHCS Softail Heritage Classic 114 2018-2024
  • FLHR Road King 2017-2021
  • FLHRXS Road King Special 2017-2023
  • FLHT Electra Glide Standard 2019-2022
  • FLHTCU Electra Glide Ultra Classic 2017-2019
  • FLHTCUTG Tri Glide Ultra Classic 2018-2024
  • FLHTK Electra Glide Ultra Limited 2017-2023
  • FLHTKL Electra Glide Ultra Limited Low 2017-2019
  • FLHX Street Glide 2017-2023
  • FLHXS Street Glide Special 2017-2023
  • FLRT Freewheeler 2017-2022
  • FLSB Softail Sport Glide 2018-2021
  • FLSL Softail Slim 2018-2021
  • FLTRK Road Glide Limited 2020-2023
  • FLTRU Road Glide Ultra 2017-2019
  • FLTRX Road Glide 2017-2023
  • FLTRXS Road Glide Special 2017-2023
  • FXBB Softail Street Bob 2018-2020
  • FXBBS Softail Street Bob 114 2021-2024
  • FXBR Softail Breakout 2018-2019
  • FXBRS Softail Breakout 114 2018-2019
  • 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 2020-2024
  • FXST Softail Standard 2020-2022

Customer Reviews

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The Good Stuff S&S

By   on  Verified Purchaser

Looks to be good stuff from S&S have not installed yet, porting the heads first, new springs and seals.


Great Part and Quick

By   on  Verified Purchaser

A must have for performance engines. This kit will keep your top end tight which is very important.


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