# S&S Cycle 66-84 BT 80in 3-1/2in Bore Cylinder and High Compression Piston Kit

This kit is intended to replace the cylinders and pistons of a 80" shovelhead engine and increase the compression ratio to 9:1. Compatible with stock or S&S cylinder heads. Kit includes S&S 3-1/2" bore high tensile cast iron cylinders, 3-1/2" bore forged high compression pistons for 80" (4-1/4" stroke) engines with rings and wristpins, head gaskets, S&S stainless steel head bolts with washers, base nuts, base gaskets.

This Part Fits:

Year

Make

Model

Submodel

1979-1984

Harley-Davidson

FLH Electra Glide

Base

1980-1984

Harley-Davidson

FLHS Electra Glide Sport

Base

1984

Harley-Davidson

FLHX Electra Glide Special

Base

1980-1983

Harley-Davidson

FLT Tour Glide

Base

1981

Harley-Davidson

FLTC Tour Glide Classic

Base

1982-1983

Harley-Davidson

FXR Super Glide II

Base

## Details

- **Price:** 2853.14 CAD
- **Vendor:** S&S Cycle
- **Type:** Piston Sets - Powersports

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2853.14 CAD | In stock |

## Images

- User 1

---

> Source: [Standard Auto Part](https://www.standardautopart.com/products/s-s-cycle-66-84-bt-80in-3-1-2in-bore-cylinder-and-high-compression-piston-kit)
> Updated: 2026-07-13