S&S CYCLE - 31-0004 - Engine Case - Super Stock Big Bore - 3.625” - Big Twin
The S&S CYCLE 31-0004 is an engine case - super stock® big bore - 3.625” - big twin engineered for street applications where fit, function, and build quality are the baseline expectation. 3.625” big bore cylinder case for any stroke up to and including 5” and most stock length connecting rods. Machined to accept an oil filter assembly that mounts on the front of stock motor cases, giving you a level of quality that holds up across the full service life of the component. All races are line-honed and breather cavity is precision-machined to optimize breather timing for maximum oil scavenging. Kit includes crankcase bolts, washers and nuts, cylinder mounting studs, timing hole plug, magnetic drain plug, assorted breather and oil line fittings, oil pressure switch, oil screen, spring and plug, sprocket shaft Timken® bearing assembly and oil seal, pinion shaft main bearing race, cam needle bearing assembly, oil pump drive shaft bushing and installation instructions. Machined for EFI fitment. The 31-0004 delivers exactly what riders need from a quality aftermarket component. Sold as a complete kit.
Features
- 3.625” big bore cylinder case for any stroke up to and including 5” and most stock length connecting rods
- Machined to accept an oil filter assembly that mounts on the front of stock motor cases
- All races are line-honed and breather cavity is precision-machined to optimize breather timing for maximum oil scavenging
- Kit includes crankcase bolts, washers and nuts, cylinder mounting studs, timing hole plug, magnetic drain plug, assorted breather and oil line fittings, oil pressure switch, oil screen, spring and plug, sprocket shaft Timken® bearing assembly and oil seal, pinion shaft main bearing race, cam needle bearing assembly, oil pump drive shaft bushing and installation instructions
- Machined for EFI fitment
- Made in the USA
Specs
- Riding Style: Street
- Color/Finish: Raw
- Model: Super Stock®
- Product Name: Engine Case
- Bore Size: 3.625”
- Material: A356 T-6 Aluminum Alloy
- Units: Kit
- Type: Big Bore
Frequently Asked Questions - S&S CYCLE - 31-0004 - Engine Case - Super Stock Big Bore - 3.625” - Big Twin
How do I know if this part fits my vehicle?
Check the fitment information listed on this page against your exact year, make, model, and (where applicable) trim, engine size, or configuration. If your exact vehicle isn't listed, or you're not sure, use the product chat on this page or contact our support team before ordering - we're glad to help confirm fitment.
What does it mean if a product is listed as universal fit?
Universal fit means the product is designed to work across a range of vehicles, not that it's guaranteed to fit every one. Compare the listed measurements, mounting requirements, and connector or hardware specs against your specific vehicle before ordering, since some installations may need additional hardware or minor fabrication.
Where can I find installation instructions for this product?
General installation notes are provided above where available. For detailed step-by-step instructions, refer to the manufacturer's documentation included with the product, or use the product chat on this page for questions about difficulty, required tools, or whether professional installation is recommended.
What if I have more questions about this product?
Use the product chat on this page for fitment, specs, installation, and compatibility questions, or contact our support team directly for help before you order.
