S&S CYCLE - 920-0100 - Big Bore Forged Piston Kit - 3.937” Bore - 107” Twin Cam - Standard
When it is time for a top-end rebuild, the piston you choose sets the ceiling on everything that comes after, and the S&S CYCLE 920-0100 delivers the precision that serious riders and race mechanics expect. Pistons are compatible with stock rods with tapered wristpin ends, ensuring dimensional accuracy from the first start-up. Stock cylinders may be bored to accommodate larger piston, which means it holds tight tolerances longer and runs cooler. Bore cylinders to nominal diameter +/- 0.0005” for correct clearance, and compression Ratio: 10.4:1 helps the new piston seat properly during break-in. Product Name: Piston Kit. Whether refreshing a worn top-end or building a motor from scratch, the 920-0100 gives you a solid foundation for a long-lasting engine. Sold as a complete kit.
Features
- Pistons are compatible with stock rods with tapered wristpin ends
- Stock cylinders may be bored to accommodate larger piston
- Bore cylinders to nominal diameter +/- 0.0005” for correct clearance
Specs
- Compression Ratio: 10.4:1
- Units: Kit
- Product Name: Piston Kit
- Stroke Length: 4-3/8”
- Bore - Oversize: Standard
- Bore Oversize: Standard
- Displacement: 107”
- Piston Material: Forged
- Style: Big Bore
- Bore Size: 3.937”
- Riding Style: Street
Frequently Asked Questions - S&S CYCLE - 920-0100 - Big Bore Forged Piston Kit - 3.937” Bore - 107” Twin Cam - Standard
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.
