# S&S Cycle 99-06 BT 4-18in Bore Crankcase - Silver

This crankcase is intended to replace the crankcases in HD® Twin Cam 88® engines in existing HD® chassis only. S&S stock style crankcases have a rear motor mount that bolts directly to the stock 1999-'06 transmission for all models except 2006 HD® Dyna®. These crankcases are compatible with the stock primary, charging system, and other stock components. S&S replacement crankcases are not available for HD® Twin Cam 88B™ or 2007-'16 HD® Twin Cam 96™ or HD® Twin Cam 96B™ engines. Stock bore cases are perfect for replacement applications, 4" bore cases are a natural for use with the S&S Super Sidewinder® Hot Set Up Kits®, and 41/8" bore cases make really large displacement custom engines possible, and are available with the S&S cylinder stud pattern or with the stock cylinder stud pattern. 41/8" bore cases with stock stud pattern are ideal for the S&S 124" Hot Set Up Kit® for stock crankcases.

This Part Fits:

Year

Make

Model

Submodel

1999-2006

Harley-Davidson

FLHR Road King

Base

2004-2006

Harley-Davidson

FLHRS Road King Custom

Base

1999-2006

Harley-Davidson

FLHT Electra Glide Standard

Base

2003

Harley-Davidson

FLHTC Electra Glide Classic

Base

2006

Harley-Davidson

FLHX Street Glide

Base

1999-2002

Harley-Davidson

FLTR Road Glide

Base

1999-2005

Harley-Davidson

FXD Dyna Super Glide

Base

2005

Harley-Davidson

FXDC Super Glide Custom

Base

1999-2005

Harley-Davidson

FXDL Dyna Low Rider

Base

1999-2005

Harley-Davidson

FXDWG Dyna Wide Glide

Base

2001

Harley-Davidson

FXDWG2 CVO Dyna Wide Glide

Base

2002

Harley-Davidson

FXDWG3 CVO Dyna Wide Glide

Base

1999-2005

Harley-Davidson

FXDX Dyna Super Glide Sport

Base

2004-2005

Harley-Davidson

FXDXI Dyna Super Glide Sport

Base

2001-2003

Harley-Davidson

FXDXT Dyna Super Glide T-Sport

Base

## Details

- **Price:** 3081.86 CAD
- **Vendor:** S&S Cycle
- **Type:** Crankshafts

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 3081.86 CAD | In stock |

## Images

- User 1

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/s-s-cycle-99-06-bt-4-18in-bore-crankcase-silver)
> Updated: 2026-07-13