Harddrive Billet Oil Pump 1973-1991 - Harley-Davidson Big Twin
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.
Enhance the oiling system of your Harley-Davidson Big Twin with this Harddrive Billet Oil Pump. CNC machined from cast aluminum, this pump is designed to upgrade earlier 1973-1980 engines to a more efficient 1981-up oiling system. This critical upgrade increases oil pressure to hydraulic lifters and the top end.
Why riders pick this
- CNC machined cast aluminum construction
- Splits bottom and top end oil supply for better pressure
- Increases oil pressure to hydraulic lifters and top end
- Includes all necessary gaskets and hardware for installation
- Optional fitting locations for custom oil line routing
Optimal oil pressure is vital for the longevity and performance of your Big Twin engine. This Harddrive Billet Oil Pump not only provides a durable, high-quality replacement but also delivers a significant upgrade for older models. By splitting the bottom and top end oil supply, it ensures that your engine's most critical components receive consistent lubrication, especially under demanding conditions.
Enhanced Oiling for Peak Performance
- Cast aluminum construction, CNC machined and polished for durability
- Splits bottom and top end oil supply for increased hydraulic lifter pressure
- Routes surplus oil to the main passage to avoid unnecessary filtering
- Includes gaskets, drive shaft with keys and snap ring, check ball, and relief valve assemblies
- Optional oil supply fitting locations for custom routing possibilities
A Smart Upgrade for Big Twin Engines
This billet oil pump is an essential upgrade for any rider looking to improve the reliability and performance of their 1973-1991 Harley-Davidson Big Twin. The enhanced oiling system helps prevent premature wear on valve train components by delivering consistent, higher pressure. While some earlier cases may require minor modifications, the benefits of improved lubrication are well worth the investment for a robust and long-lasting engine.
Specifications
- Brand: Harddrive
- Manufacturer Part #: 301495
- UPC: 191361165443
- Length: 7.65 in
- Width: 7.6 in
- Height: 3.6 in
- Weight: 2.84 lbs
- Country of Origin: China (Taiwan)
Common questions
Will this oil pump fit my 1973-1980 Big Twin engine?
Yes, this pump fits 1973-1991 Big Twin engines. However, cases manufactured between 1970-1980 may require some drilling for proper fitment. Always verify your engine's requirements before installation.
Does this oil pump require any other modifications to my engine?
The primary modification, if any, would be the potential drilling for earlier 1970-1980 cases. Beyond that, it's designed as an upgrade to the existing oiling system without requiring extensive engine overhauls.
What is the benefit of splitting the oil supply?
Splitting the oil supply ensures that critical components like hydraulic lifters and the top end receive dedicated, higher-pressure oil flow. This improves lubrication efficiency and can extend the lifespan of these vital engine parts.
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 | 820-50102 |
| WEIGHT | 2.84 lb |
