S&S CYCLE - 91-9017 - 3-7/16” Bore Cylinder and Stroker Piston Kit - Big Twin
Engine rebuilds done right start with the right piston, and the S&S CYCLE 91-9017 delivers the precision that top-tier aftermarket suppliers build their reputation on. Cylinder and piston kit can be used to build 84”, 86” or 88” stroker engines, or to replace the cylinders and piston in an engine with an existing S&S® stock bore stroker kit, ensuring dimensional accuracy from the first start-up. Can be used in engines with 4-1/2”, 4-5/8” or 4-3/4” stroke flywheels, which means it holds tight tolerances longer and runs cooler. 4-1/2” Stroke - 84” - 8.4:1 Compression 4-5/8”, Stroke - 86” - 9.4:1 Compression 4-3/4”, Stroke - 88” - 10.8:1 Compression, and includes 3.4375” bore high tensile cast iron cylinders, 3.4375” bore forged pistons with rings and wristpins, head gaskets, S&S stainless steel head bolts with washers, base nuts and base gaskets helps the new piston seat properly during break-in. Made in the U.S.A.. Whether refreshing a worn top-end or building a motor from scratch, the 91-9017 gives you a solid foundation for a long-lasting engine. Sold as a complete kit.
Features
- Cylinder and piston kit can be used to build 84”, 86” or 88” stroker engines, or to replace the cylinders and piston in an engine with an existing S&S® stock bore stroker kit
- Can be used in engines with 4-1/2”, 4-5/8” or 4-3/4” stroke flywheels
- 4-1/2” Stroke - 84” - 8.4:1 Compression 4-5/8”, Stroke - 86” - 9.4:1 Compression 4-3/4”, Stroke - 88” - 10.8:1 Compression
- Includes 3.4375” bore high tensile cast iron cylinders, 3.4375” bore forged pistons with rings and wristpins, head gaskets, S&S stainless steel head bolts with washers, base nuts and base gaskets
- Made in the U.S.A.
Specs
- Compression Ratio: 8.4:1
- Displacement: 86”
- Material: Cast Iron
- Bore Size: 3.4375”
- Displacement: 88”
- Riding Style: Street
- Product Name: Cylinder and Piston Kit
- Type: Stock Bore Cylinder
- Displacement: 84”
- Color/Finish: Gloss Black
- Units: Kit
Frequently Asked Questions - S&S CYCLE - 91-9017 - 3-7/16” Bore Cylinder and Stroker Piston Kit - 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.
