Harddrive Twin Cam 3.75" STD Bore Black with Machined Fins Cylinder - Harley Twin Cam
About Harddrive
Harddrive is the house performance and replacement line built for American V-twins, covering everything from engine hardware and electrical to controls, lighting and chassis parts. The range is aimed squarely at Harley-Davidson and Indian riders who want a direct-fit part without dealer pricing, and it spans decades of model years — from Evolution-era Softails to current Milwaukee-Eight baggers.
Refresh or upgrade your Twin Cam engine with a Harddrive Twin Cam cylinder, featuring a durable black powder coat and machined fins for a classic OEM look. These aluminum cylinders with cast iron sleeves are sold individually, offering flexibility for stock replacement or displacement increases. They require finish honing and piston matching to ensure optimal performance and longevity.
Why riders pick this
- Refresh or upgrade your Twin Cam engine
- Black powder coat with machined fins for OEM look
- Durable aluminum construction with cast iron sleeves
- Requires finish honing and piston matching before install
- Sold individually for flexible build options
Harddrive Twin Cam cylinders provide a robust foundation for your engine rebuild or performance project. Designed for the demands of V-twin engines, these cylinders are built to last. Their black finish with machined accents ensures they blend seamlessly with your existing engine components, maintaining a clean, factory-like aesthetic.
Built for Reliable Engine Performance
- Durable black powder coat with precision-machined fins
- Constructed from aluminum with robust cast iron sleeves
- Ideal for both stock replacement and displacement upgrades
- Requires finish honing for precise piston matching
- Sold individually to accommodate specific build requirements
Essential for Your Twin Cam Build
These cylinders are an essential component for any Twin Cam engine work, whether you're addressing wear or chasing more power. Remember to properly hone them and match them to your chosen pistons for a perfect fit and long-term reliability. Pair with a comprehensive top-end kit and a capable tuner for a complete, high-performing engine.
Specifications
- Brand: Harddrive
- Manufacturer Part #: 88187
- UPC: 191361123429
- Length: 10.2 in
- Width: 10.2 in
- Height: 10.2 in
- Weight: 10.36 lbs
- Country of Origin: Japan
Common questions
Are these cylinders ready to install right out of the box?
No, these cylinders require finish honing and piston matching before installation to ensure proper fitment and performance. Pistons are sold separately.
Are these cylinders sold as a pair or individually?
These Harddrive Twin Cam cylinders are sold individually. You will need to order two cylinders for a complete V-twin engine rebuild.
Will these cylinders fit my Evolution or Sportster engine?
While the product description mentions compatibility with EVO and Sportster applications, these are specifically branded Twin Cam cylinders. Please confirm fitment for your exact year and model using our Shop by Bike tool before ordering.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Harddrive |
| TYPE | Engine |
| SKU | 820-51549 |
| WEIGHT | 10.36 lb |
