# S&S Cycle 84-99 BT 88in 3 5/8in Big Bore Cylinder & Piston Kit - Natural

Installing this 3-5/8" big bore kit will increase the displacement of stock 80" HD® Evolution® big twin engines to 88" using the stock 4-1/4" flywheels. The kit includes S&S 3-5/8" bore cylinders, 3-5/8" bore flat topped forged pistons with rings and wristpins, head gaskets, base gaskets, exhcaust gaskets, and instructions. The cylinders are shorter than stock, so shorter pushrods, and shorter manifold will be needed to complete the engine.

This Part Fits:

Year

Make

Model

Submodel

1994-1998

Harley-Davidson

FLHR Road King

Base

1984,1987-1993

Harley-Davidson

FLHS Electra Glide Sport

Base

1986-1998

Harley-Davidson

FLHT Electra Glide Standard

Base

1989-1997

Harley-Davidson

FLHTC Electra Glide Classic

Base

1986-1990

Harley-Davidson

FLST Heritage Softail

Base

1988-1996,1998-1999

Harley-Davidson

FLSTC Heritage Softail Classic

Base

1990-1996,1998-1999

Harley-Davidson

FLSTF Fat Boy

Base

1993

Harley-Davidson

FLSTN Heritage Softail Nostalgia

Base

1994-1996

Harley-Davidson

FLSTN Heritage Softail Special

Base

1998-1999

Harley-Davidson

FLSTS Heritage Springer

Base

1989-1993

Harley-Davidson

FLTC Tour Glide Classic

Base

1996

Harley-Davidson

FLTCUI Tour Glide Ultra Classic

Base

1998

Harley-Davidson

FLTR Road Glide

Base

1995,1997-1998

Harley-Davidson

FXD Dyna Super Glide

Base

1992

Harley-Davidson

FXDB-D Dyna Glide Daytona

Base

1992

Harley-Davidson

FXDC Super Glide Custom

Base

1993-1995,1997-1998

Harley-Davidson

FXDL Dyna Low Rider

Base

1993-1995,1997-1998

Harley-Davidson

FXDWG Dyna Wide Glide

Base

1986-1994

Harley-Davidson

FXR Super Glide II

Base

1984-1996,1998-1999

Harley-Davidson

FXST Softail Standard

Base

1999

Harley-Davidson

FXSTB Night Train

Base

1988-1996,1998-1999

Harley-Davidson

FXSTS Springer Softail

Base

1995-1996

Harley-Davidson

FXSTSB Bad Boy

Base

## Details

- **Price:** 2008.31 CAD
- **Vendor:** S&S Cycle
- **Type:** Piston Sets - Powersports

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2008.31 CAD | In stock |

## Images

- User 1

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/s-s-cycle-84-99-bt-88in-3-5-8in-big-bore-cylinder-piston-kit-natural)
> Updated: 2026-07-13