The best choice depends on your engine and the part you need: the listed options are complete oil pumps or pump kits, not standalone billet gears. The S&S kits are application-specific choices for 1977–91 and 1992–98 Harley-Davidson Big Twin engines; the S&S 31-6203 suits custom oiling layouts, while the Moroso pump is for Chevy big-block engines. The Feuling 7010 is identified as a Twin Cam oil pump, but its supplied details do not specify fitment years.
| Product | Best suited for | Key detail |
|---|---|---|
| S&S Ultimate Oiling Kit 31-6295 | 1977–91 Big Twin applications | Application-specific kit |
| S&S Ultimate Oiling Kit 31-6296 | 1992–98 Big Twin applications | Application-specific kit |
| S&S Billet Pump 31-6203 | Custom Big Twin oiling layouts | Split oil path and multiple ports |
| Moroso 22163 | Chevy big-block builds | High-volume billet pump |
| Feuling OE Plus 7010 | Twin Cam pump shoppers | OE Plus pump designation |
S&S Ultimate Oiling Kit For 1977–91 Big Twin
This S&S Cycle kit is listed for 1977–91 Big Twin applications and carries part number 31-6295. It is the most directly matched option here for buyers seeking an oil pump kit for that stated engine range. Choose it if your engine falls within the listed application and you want the kit rather than a standalone gear set.
Best for: owners or builders of 1977–91 Big Twin engines who need an application-specific S&S oiling kit.
Limitation: The supplied product details do not describe included components, installation requirements, or individual gear dimensions. Confirm the exact engine application and kit contents before ordering.
S&S Ultimate Oiling Kit For 1992–98 Big Twin
Part number 31-6296 is listed for 1992–98 Big Twin engines. It gives buyers in that application range a separate S&S kit option from the 1977–91 version. The date range is the key comparison point: do not assume the two kits are interchangeable just because both are described as Ultimate Oiling kits.
Best for: Big Twin owners whose engine matches the stated 1992–98 application.
Limitation: The listing information does not provide detailed kit contents or confirm fitment for engines outside the stated range. Verify the engine year and configuration before purchase.
S&S Billet Aluminum Oil Pump 31-6203
This S&S billet aluminum pump is described as using the same oiling pattern as 1981–99 Big Twin engines. Its split oil path is designed to apply more pressure to the top end, and multiple oil ports provide options for plumbing a custom build. Those features make it a more adaptable choice than the two year-specific kits when a builder needs varied oil-line routing.
Best for: custom builders who need multiple oil ports and a split oil path.
Limitation: The listing does not establish universal fitment across all 1981–99 engines. Confirm the specific engine and plumbing needs; do not treat the stated oiling pattern as proof of direct fit.
Moroso 22163 High-Volume Chevy Big-Block Pump
The Moroso 22163 is described as a high-volume billet oil pump for Chevy big-block engines. It is the clear choice in this list for a Chevy build, rather than a Harley-Davidson Big Twin application. Its high-volume designation is useful for identifying the product type, but the supplied details do not include a flow rate or specific engine fitment list.
Best for: builders looking for a billet oil pump identified for Chevy big-block engines.
Limitation: The listing summary does not specify compatible engine years, exact volume, or installation details. Check those requirements for the particular engine before choosing it.
Feuling OE Plus Twin Cam Oil Pump 7010
The Feuling 7010 is identified as an OE Plus Twin Cam oil pump. That description makes it relevant to shoppers comparing replacement-style Twin Cam pumps, but the available feature information does not state model years, construction details, or whether the pump includes billet gears. It should therefore be compared by confirmed engine fitment, not by assumptions based on the product name.
Best for: buyers seeking a Feuling OE Plus pump for a Twin Cam application.
Limitation: Fitment years and technical specifications are not provided in the supplied details. Confirm them before ordering, especially if you specifically need billet gears rather than a complete pump.
Buying Guide: How To Choose Billet Oil Pump Gears Or A Pump
Do you need gears or a complete pump?
Start by identifying whether your project calls for replacement gears, a pump body, or a complete oil pump kit. These five listings describe pumps or kits; none gives enough information to confirm that it is a standalone billet gear set. If your repair specifically requires gears, verify the package contents and gear material before buying.
Which engine application should you match?
Match the part to the exact engine family and year range. The two S&S kits list distinct Big Twin ranges, while the S&S 31-6203 references an oiling pattern associated with 1981–99 Big Twin engines. Moroso 22163 is identified for Chevy big-block engines, and Feuling 7010 is described for Twin Cam use. These categories are not interchangeable.
Does your build need special oil routing?
For a custom layout, the S&S 31-6203 is the only listed product specifically described with multiple oil ports and a split oil path. If your engine uses a standard replacement setup, an application-specific kit may be a more direct starting point. Confirm the required ports, plumbing, and oiling configuration with the engine specifications.
What should you verify before ordering?
- Engine make, family, year, and configuration.
- Whether the listing is for a full pump, a kit, or gears only.
- Included components and any required installation parts.
- Oil-path design and port layout for custom plumbing.
- Fitment details not stated in the product summary.
Frequently Asked Questions
Are these listings for billet oil pump gears only?
No. The supplied names and features describe complete oil pumps or oil pump kits. They do not confirm that any listing contains standalone billet gears.
Which option is listed for 1977–91 Big Twin engines?
The S&S Ultimate Oiling Kit 31-6295 is listed for 1977–91 Big Twin applications.
Which S&S kit is listed for 1992–98 Big Twin engines?
The S&S Ultimate Oiling Kit 31-6296 is listed for 1992–98 Big Twin applications.
Which product is intended for a Chevy big-block?
The Moroso 22163 is described as a high-volume billet oil pump for Chevy big-block engines.
Which listed pump mentions multiple oil ports?
The S&S billet aluminum pump 31-6203 is described as having multiple ports for varied plumbing options.