# S&S Cycle 84-91 BT w/ 3-5/8in 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
-   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
-   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.
-   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"

## Details

- **Price:** 2795.67 CAD
- **Vendor:** S&S Cycle
- **Type:** Crankshafts

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2795.67 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-3-5-8in-bore-super-stock-alternator-style-crankcase-natural)
> Updated: 2026-08-15