S&S Cycle 4.425" bore crankcase for 2006-2017 Harley-Davidson Dyna models, machined from 356-T6 aircraft-grade aluminum with thicker wall sections for strength. Direct replacement for stock Dyna crankcases or foundation block 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" and cams up to .720" lift
- Reinforced front motor mount
- Studs and cam bearings pre-installed
- Pinion and Timken® bearing included
- Tough 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 #: 310-0859
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Bore: 4.425 inch
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Category: Engine Components / Crankshafts
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Weight: 36.5 lb
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Material: 356-T6 aircraft-grade aluminum
Fitment
Fits 2006-2017 Harley-Davidson Dyna models. Also serves as a foundation block for custom engine builds using T111, T124, or T145 configurations.
Frequently Asked Questions
Does this fit 2006-2017 Dyna models?
Yes — direct fit for all 2006-2017 Harley-Davidson Dyna models as a stock bore replacement.
Can I use this for a custom engine build?
Yes — the crankcase is designed as a foundation block for custom engine builds using T111, T124, or T145 configurations.
What bearings and hardware come installed?
Studs, cam bearings, pinion, and Timken® bearing are pre-installed. Fasteners for motor mounts are included.
What makes this stronger than stock?
356-T6 aircraft-grade aluminum with thicker wall sections throughout, plus a reinforced front motor mount design.
Does this require a Manufacturer's Statement of Origin?
Yes — an MSO is included with this crankcase for title and registration purposes if building a custom engine.
