# S&S Cycle 84-91 BT w/ Stock Bore Super Stock Alternator Style Crankcase -Natural

Perfect for stock replacement and high performance applications, these crankcases offer some unique features. Besides being machined for a crank position sensor, they are also compatible with stock flywheel assemblies, primary covers, gearcovers and are clearanced for 38 amp alternator stators.

-   Compatible with stock 1984-'99 flywheel assemblies, primary covers, gearcovers, and clearanced for 38 amp alternator stators, making them perfect for stock replacement or high performance applications
-   Machined for installation of a crank position sensor, allowing the cases to be used in stock EFI applications and allows easy installation of S&S IST® Ignition and VFI Fuel Injection.
-   A ported breather passageway and a machined breather window allows the air/oil mist to flow from the flywheel cavity to the cam chest of the engine with the least possible restriction
-   Crankcase venting can be achieved via two crankcase breathers, the cylinder heads, or both. We recommend using both crankcase breathers in engines larger than 95"
-   Relocated cam chest oil pick-up increases gear case scavenging and virtually eliminates oil carry-over at sustained high speeds
-   Machined to accept the stock oil filter assembly used on 1984-'91 big twins
-   Clearanced for strokes as long as 5"
-   183

This Part Fits:

Year

Make

Model

Submodel

1984,1987-1991

Harley-Davidson

FLHS Electra Glide Sport

Base

1986-1990

Harley-Davidson

FLST Heritage Softail

Base

1988-1991

Harley-Davidson

FLSTC Heritage Softail Classic

Base

1990-1991

Harley-Davidson

FLSTF Fat Boy

Base

1987-1991

Harley-Davidson

FXLR Low Rider Custom

Base

1984-1991

Harley-Davidson

FXRS Low Glide

Base

1984-1991

Harley-Davidson

FXRT Sport Glide

Base

1984-1991

Harley-Davidson

FXST Softail Standard

Base

1988-1991

Harley-Davidson

FXSTS Springer Softail

Base

1984-1986

Harley-Davidson

FXWG Wide Glide

Base

## Details

- **Price:** 2710.63 CAD
- **Vendor:** S&S Cycle
- **Type:** Crankshafts

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2710.63 CAD | In stock |

## Images

- User 1

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/s-s-cycle-84-91-bt-w-stock-bore-super-stock-alternator-style-crankcase-natural)
> Updated: 2026-07-13