# S&S Cycle 2007+ BT 3.937in x 4-3/8in Piston Set

These big bore pistons work with the stock 4-3/8" stroke flywheels to convert any 2007-'16 HD® big twin engine from 96" or 103" to 107" displacement with 10.4:1 compression with stock heads. Stock cylinders may be bored to accomodate larger pistons, but we recommend S&S 3.927" bore cylinders which feature high strength alloyed cast iron liners. Pistons are compatible with stock rods with tapered wristpin ends. S&S® 3.927" bore pistons are machined to such close tolerances that it is not necessary to measure the piston. Just bore cylinders to nominal diameter +/- 0.0005" for correct clearance. Additionally, the low friction coating on the piston skirt makes taking measurements very difficult. 3.937" standard bore.

This Part Fits:

Year

Make

Model

Submodel

2007-2016

Harley-Davidson

FLHR Road King

Base

2008-2013

Harley-Davidson

FLHRC Road King Classic

Base

2007

Harley-Davidson

FLHRS Road King Custom

Base

2007-2009

Harley-Davidson

FLHT Electra Glide Standard

Base

2009-2013

Harley-Davidson

FLHTC Electra Glide Classic

Base

2009-2016

Harley-Davidson

FLHTCU Electra Glide Ultra Classic

Base

2015-2016

Harley-Davidson

FLHTCUL Electra Glide Ultra Classic Low

Base

2009

Harley-Davidson

FLHTCUSE4 CVO Ultra Classic Electra Glide

Base

2010

Harley-Davidson

FLHTCUSE5 CVO Ultra Classic Electra Glide

Base

2009,2011-2014

Harley-Davidson

FLHTCUTG Tri Glide Ultra

Base

2009-2013

Harley-Davidson

FLHTCUTG Tri Glide Ultra Classic

Base

2010-2014

Harley-Davidson

FLHTK Electra Glide Ultra Limited

Base

2015-2017

Harley-Davidson

FLHTKSE CVO Limited

Base

2007-2016

Harley-Davidson

FLHX Street Glide

Base

2014,2016

Harley-Davidson

FLHXS Street Glide Special

Base

2015-2017

Harley-Davidson

FLHXSE CVO Street Glide

Base

2011

Harley-Davidson

FLHXSE2 CVO Street Glide

Base

2012

Harley-Davidson

FLHXSE3 CVO Street Glide

Base

2015-2016

Harley-Davidson

FLRT Freewheeler

Base

2012-2017

Harley-Davidson

FLS Softail Slim

Base

2016-2017

Harley-Davidson

FLSS Softail Slim S

Base

2007-2017

Harley-Davidson

FLSTC Heritage Softail Classic

Base

2007-2017

Harley-Davidson

FLSTF Fat Boy

Base

2010-2016

Harley-Davidson

FLSTFB Fat Boy Lo

Base

2016-2017

Harley-Davidson

FLSTFBS Fat Boy S

Base

2007-2014,2017

Harley-Davidson

FLSTN Softail Deluxe

Base

2014-2015

Harley-Davidson

FLSTNSE CVO Softail Deluxe

Base

2008-2011

Harley-Davidson

FLSTSB Cross Bones

Base

2007-2009

Harley-Davidson

FLTR Road Glide

Base

2009

Harley-Davidson

FLTRSE3 CVO Road Glide

Base

2011-2013,2016

Harley-Davidson

FLTRU Road Glide Ultra

Base

2015-2016

Harley-Davidson

FLTRUSE CVO Road Glide Ultra

Base

2015-2016

Harley-Davidson

FLTRX Road Glide

Base

2010-2013

Harley-Davidson

FLTRX Road Glide Custom

Base

2015-2016

Harley-Davidson

FLTRXS Road Glide Special

Base

2012

Harley-Davidson

FLTRXSE CVO Road Glide Custom

Base

2008-2009

Harley-Davidson

FXCW Rocker

Base

2008-2011

Harley-Davidson

FXCWC Rocker C

Base

2007-2010

Harley-Davidson

FXD Dyna Super Glide

Base

2007-2016

Harley-Davidson

FXDB Street Bob

Base

2007-2014

Harley-Davidson

FXDC Super Glide Custom

Base

2008-2017

Harley-Davidson

FXDF Fat Bob

Base

2009

Harley-Davidson

FXDFSE CVO Dyna Fat Bob

Base

2007-2009,2014-2017

Harley-Davidson

FXDL Dyna Low Rider

Base

2014-2017

Harley-Davidson

FXDL Low Rider

Base

2016-2017

Harley-Davidson

FXDLS Low Rider S

Base

2007-2008,2010-2017

Harley-Davidson

FXDWG Dyna Wide Glide

Base

2011-2013

Harley-Davidson

FXS Blackline

Base

2014-2017

Harley-Davidson

FXSB Breakout

Base

2013

Harley-Davidson

FXSBSE CVO Breakout

Base

2016-2017

Harley-Davidson

FXSE CVO Pro Street Breakout

Base

2007

Harley-Davidson

FXST Softail Standard

Base

2007-2009

Harley-Davidson

FXSTB Night Train

Base

2008,2010

Harley-Davidson

FXSTC Softail Custom

Base

2007

Harley-Davidson

FXSTD Softail Deuce

Base

2009

Harley-Davidson

FXSTSSE3 CVO Softail Springer

Base

## Details

- **Price:** 734.97 CAD
- **Vendor:** S&S Cycle
- **Type:** Piston Sets - Powersports

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 734.97 CAD | In stock |

## Images

- Photo - Primary

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/s-s-cycle-2007-bt-3-937in-x-4-3-8in-piston-set)
> Updated: 2026-07-01