# S&S Cycle 2017 M8 Models Big Bore Top End Guardian Kit

Building your M8 for big power? S&S has 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 Stud Kit, Head Bolt Kit and Performance Roller Rocker Arms are included in this kit that is the perfect topper for your high performance M8 build.

-   Head Bolt Kit - Heat Treated 8640 Steel, 200,000 psi Ultimate Tensile Strength, 14 percent increases in strength over stock
-   Forged Roller Rocker Arms - Forged from 8620 steel for greater strength, designed using Finite Element Analysis (FEA)
-   Rocker Arm Shafts - Replace broken or worn OEM pieces with stronger, more durable S&S performance parts
-   Rocker Arm Stud Kit - Extend the life of your cylinder heads

This Part Fits:

Year

Make

Model

Submodel

2018-2020

Harley-Davidson

FLDE Deluxe 107

Base

2018-2021

Harley-Davidson

FLFBS Fat Boy 114

Base

2018-2021

Harley-Davidson

FLHCS Heritage Classic 114

Base

2017-2021

Harley-Davidson

FLHR Road King

Base

2017-2021

Harley-Davidson

FLHRXS Road King Special

Base

2019-2021

Harley-Davidson

FLHT Electra Glide Standard

Base

2017-2019

Harley-Davidson

FLHTCU Electra Glide Ultra Classic

Base

2020-2021

Harley-Davidson

FLHTCUTGSE CVO Tri Glide

Base

2017-2021

Harley-Davidson

FLHTK Ultra Limited

Base

2017-2019

Harley-Davidson

FLHTKL Ultra Limited Low

Base

2017-2021

Harley-Davidson

FLHTKSE CVO Limited

Base

2017-2021

Harley-Davidson

FLHX Street Glide

Base

2017-2021

Harley-Davidson

FLHXS Street Glide Special

Base

2017-2021

Harley-Davidson

FLHXSE CVO Street Glide

Base

2017-2021

Harley-Davidson

FLRT Freewheeler

Base

2020-2021

Harley-Davidson

FLTRK Road Glide Limited

Base

2017-2019

Harley-Davidson

FLTRU Road Glide Ultra

Base

2017-2021

Harley-Davidson

FLTRX Road Glide

Base

2017-2021

Harley-Davidson

FLTRXS Road Glide Special

Base

2018-2020

Harley-Davidson

FXBRS Breakout 114

Base

2019-2020

Harley-Davidson

FXDRS FXDR 114

Base

2018-2021

Harley-Davidson

FXFBS Fat Bob 114

Base

2020

Harley-Davidson

FXLRS Low Rider S 114

Base

## Details

- **Price:** 1323.73 CAD
- **Vendor:** S&S Cycle
- **Type:** Heads

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1323.73 CAD | In stock |

## Images

- Photo - Primary
- Photo - Primary
- User 1

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/s-s-cycle-2017-m8-models-big-bore-top-end-guardian-kit)
> Updated: 2026-07-13