Sidewinder® Big Bore Stroker Engine Performance Kit — 96", 3.625" bore, 4.625" stroke

S&S CYCLE Sidewinder® Big Bore Stroker Engine Performance Kit — 96", 3.625" bore, 4.625" stroke – 70-84 Big Twin, 80-83 Touring, 82-84 FXR, 84 Police

S&S CYCLE
0903-1299
91-9134
Complete Sidewinder Big Bore stroker kit with forged pistons, cast iron cylinders, balanced flywheel assembly and all required gaskets; made in U.S.A.
Hurry! only 7 items left in stock.
€2,973.88
€3,738.59
Save €764.71
local_shipping In stock, ships in 20-25 days
Quantity

  Delivery policy

In stock items will be shipped within 1-3 days.

  Return policy

You can return the products within 14 days for a full refund, check our returns policy.

The Sidewinder® Big Bore Stroker Engine Performance Kit upgrades stock 74" or 80" H-D Shovelhead motors into a high-performance stroker with complete, track-proven components. 🔧

This kit contains nearly everything needed for a full big-bore conversion: high-tensile cast iron Sidewinder cylinders, forged pistons with wrist pins and rings, a dynamically balanced flywheel assembly with heavy-duty connecting rods and mainshafts, stainless steel head bolts, adjustable chromoly pushrods, head and base gaskets, exhaust gaskets, and a heavy-duty top motor mount.

Designed and manufactured in the U.S.A. 🇺🇸

: 0903-1299
: 7 Items
In Stock

Data sheet

Type
Engine
Units
Kit
Color/Finish
Black
Base Color
Black
Style
Big Bore
Brand
S&S CYCLE
Bore Size
3,625"
Displacement
96"
Stroke Length
4-5/8"
Compression Ratio
9.1:1

Shipping Policy

Shipping Areas:

We ship to:

  • Spain (Peninsula and Balearic Islands)
  • European Union countries

We do not ship to the Canary Islands, Ceuta, or Melilla.

Shipping Times:

  • Spain (Peninsula): 2–4 business days
  • Balearic Islands: 3–5 business days
  • EU countries: 3–7 business days depending on destination

Shipping Costs:

Shipping costs are calculated automatically at checkout based on destination and weight.

Free shipping may be offered for qualifying orders, as specified on our website.

Order Processing:

Orders are processed within 1–2 business days after payment confirmation. Orders placed on weekends or public holidays are processed the next business day.

Delivery Issues:

If your order is delayed or arrives damaged, you must notify us within 14 calendar days. We will investigate the issue and offer a resolution in accordance with applicable consumer protection laws.

Return & Withdrawal Policy

Right of Withdrawal:

In accordance with Royal Legislative Decree 1/2007 (Ley de Defensa de los Consumidores y Usuarios), you have the right to withdraw from your purchase within 14 calendar days from the date of receipt, without giving any reason.

To exercise this right, contact us via email or through our website, providing your order number and contact details.

Return Conditions:

  • Products must be unused, in original condition and packaging.
  • Return shipping costs are the responsibility of the customer, unless the product is defective or sent in error.
  • Refunds will be issued within 14 days of receiving the returned goods.

Items Excluded from Return:

  • Custom or personalized products
  • Sealed items that were unsealed after delivery and are unsuitable for return due to hygiene (e.g. cosmetics, personal care)
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If you want to return an item, please contact us first to give you detailed instructions.

This product fits the following vehicles. Use the filters below to narrow down the list if needed.

Manufacturer Model Family Year Notes
Harley Davidson Electra Glide Big Twin 1970
Harley Davidson Electra Glide Big Twin 1971
Harley Davidson Electra Glide Big Twin 1972
Harley Davidson Electra Glide Big Twin 1973
Harley Davidson Electra Glide Big Twin 1974
Harley Davidson Electra Glide Big Twin 1975
Harley Davidson Electra Glide Big Twin 1976
Harley Davidson Electra Glide Big Twin 1977
Harley Davidson Electra Glide Big Twin 1970
Harley Davidson Electra Glide Big Twin 1971
Harley Davidson Electra Glide Big Twin 1972
Harley Davidson Electra Glide Big Twin 1973
Harley Davidson Electra Glide Big Twin 1974
Harley Davidson Electra Glide Big Twin 1975
Harley Davidson Electra Glide Big Twin 1976
Harley Davidson Electra Glide Big Twin 1977
Harley Davidson Electra Glide Big Twin 1978
Harley Davidson Electra Glide Big Twin 1979
Harley Davidson Electra Glide Big Twin 1980
Harley Davidson Electra Glide Big Twin 1981
Harley Davidson Electra Glide Big Twin 1982
Harley Davidson Electra Glide Big Twin 1983
Harley Davidson Electra Glide Belt Drive Big Twin 1984
Harley Davidson Electra Glide Classic Big Twin 1979
Harley Davidson Electra Glide Big Twin 1980
Harley Davidson Electra Glide Classic Big Twin 1981
Harley Davidson Electra Glide Classic Big Twin 1982
Harley Davidson Electra Glide Classic Big Twin 1983
Harley Davidson Electra Glide Touring 1983
Harley Davidson Tour Glide Touring 1980
Harley Davidson Tour Glide Touring 1981
Harley Davidson Tour Glide Touring 1982
Harley Davidson Tour Glide Touring 1983
Harley Davidson Tour Glide Classic Touring 1980
Harley Davidson Tour Glide Classic Touring 1981
Harley Davidson Tour Glide Classic Touring 1982
Harley Davidson Tour Glide Classic Touring 1983
Harley Davidson Super Glide Big Twin 1971
Harley Davidson Super Glide Big Twin 1972
Harley Davidson Super Glide Big Twin 1973
Harley Davidson Super Glide Big Twin 1974
Harley Davidson Super Glide Big Twin 1975
Harley Davidson Super Glide Big Twin 1976
Harley Davidson Super Glide Big Twin 1977
Harley Davidson Super Glide Big Twin 1978
Harley Davidson Sturgis Big Twin 1980
Harley Davidson Sturgis Big Twin 1981
Harley Davidson Sturgis Big Twin 1982
Harley Davidson Big Twin 1983
Harley Davidson Big Twin 1984
Harley Davidson Super Glide Big Twin 1974
Harley Davidson Super Glide Big Twin 1975
Harley Davidson Super Glide Big Twin 1976
Harley Davidson Super Glide Big Twin 1977
Harley Davidson Super Glide Big Twin 1978
Harley Davidson Super Glide Big Twin 1981
Harley Davidson Super Glide Big Twin 1982
Harley Davidson Super Glide Big Twin 1983
Harley Davidson Super Glide Big Twin 1984
Harley Davidson Fat Bob Big Twin 1979
Harley Davidson Fat Bob Big Twin 1980
Harley Davidson Fat Bob Big Twin 1981
Harley Davidson Fat Bob Big Twin 1982
Harley Davidson Super Glide II FXR 1982
Harley Davidson Super Glide II FXR 1983
Harley Davidson Super Glide II FXR 1984
Harley Davidson Disc Glide Big Twin 1984
Harley Davidson Sport Glide Police Police 1984
Harley Davidson Low Glide FXR 1984
Harley Davidson Super Glide II FXR 1982
Harley Davidson Sport Glide FXR 1984
Harley Davidson Low Rider Big Twin 1977
Harley Davidson Low Rider Big Twin 1978
Harley Davidson Low Rider Big Twin 1979
Harley Davidson Low Rider Big Twin 1980
Harley Davidson Low Rider Big Twin 1981
Harley Davidson Low Rider Big Twin 1982
Harley Davidson Low Rider Big Twin 1983
Harley Davidson Low Rider Big Twin 1984
Harley Davidson Wide Glide Big Twin 1980
Harley Davidson Wide Glide Big Twin 1981
Harley Davidson Wide Glide Big Twin 1982
Harley Davidson Wide Glide Big Twin 1983
Harley Davidson Wide Glide Big Twin 1984