S&S Cycle crankcases for 2006-2017 Harley-Davidson Dyna models, machined from 356-T6 aircraft-grade aluminum with thicker wall sections for added strength. Stock-bore replacement designed to work with S&S oil line kits and as a foundation for custom engine builds.
Features
- 356-T6 aircraft-grade aluminum construction
- Thicker wall sections for durability
- Timken sprocket shaft bearing
- Clearanced for strokes up to 4 13/16 in. and cams up to .720 in. lift
- Reinforced front motor mount
- Studs and cam bearings pre-installed
- Pinion and Timken bearing included
- Powder coat finish
- Manufacturer's Statement of Origin (MSO) included
Specifications
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Brand: S&S Cycle
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Manufacturer Part #: 310-0878
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Category: Engine Components / Crankshafts
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Weight: 36.35 lb
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Bore Size: 4 1/8 in. and 4.425 in.
Fitment
Fits 2006-2017 Harley-Davidson Dyna models as a stock-bore replacement or foundation for custom engine builds. Compatible with S&S oil line installation kits.
Frequently Asked Questions
Will this crankcase work with my custom stroker build?
Yes — it's clearanced for strokes up to 4 13/16 in. and cams up to .720 in. lift, making it suitable for most custom applications.
What's included in the box?
The crankcase with studs and cam bearings pre-installed, plus pinion and Timken bearing. Manufacturer's Statement of Origin is also included.
Is this a direct bolt-in replacement for stock Dyna crankcases?
Yes, for 2006-2017 Dyna models. It's a stock-bore replacement that uses existing accessories.
Why is this crankcase stronger than OEM?
S&S uses 356-T6 aircraft-grade aluminum with thicker wall sections and a reinforced front motor mount compared to the factory design.
Will this fit Touring or Softail models?
No — this crankcase is designed specifically for 2006-2017 Dyna chassis. Touring and Softail models require different part numbers.
