S&S Cycle 4 1/8" bore crankcase for 2006-2017 Harley-Davidson Dyna models, machined from 356-T6 aircraft-grade aluminum with thicker wall sections for strength. A stock-appearing foundation for custom engine builds or direct replacement for T111, T124, or T144 applications.
Features
- 4 1/8" and 4.425" bore options for custom or stock replacement
- Timken® sprocket shaft bearing rated for extreme duty
- Clearanced for strokes up to 4 13/16" and cams to .720" lift
- Studs and cam bearings pre-installed
- Pinion and Timken® bearing included
- Reinforced front motor mount
- Tough powder coat finish
- 356-T6 aircraft-grade aluminum construction
Specifications
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Brand: S&S Cycle
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Manufacturer Part #: 310-0856
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Bore Size: 4 1/8" (stock replacement)
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Weight: 36.35 lb
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Material: 356-T6 aircraft-grade aluminum
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Category: Engine Components / Crankshafts
Fitment
Fits 2006-2017 Harley-Davidson Dyna models as a stock bore replacement or foundation for custom engine builds using the S&S oil line installation kit.
Frequently Asked Questions
Will this fit my 2018+ Dyna?
No — this crankcase is engineered for 2006-2017 Dyna models only. Newer M8 engines require different crankcases.
Can I use this for a big-bore engine?
Yes. The case is clearanced for strokes up to 4 13/16" and cams to .720" lift, making it suitable for custom displacement builds.
What's included in the box?
The crankcase with studs, cam bearings, pinion, and Timken® bearing pre-installed, plus manufacturer's statement of origin (MSO).
Is this stronger than stock Harley crankcases?
Yes. S&S uses thicker wall sections and 356-T6 aircraft-grade aluminum, with a reinforced front motor mount for extra durability.
Can I use this to replace a damaged T111, T124, or T144?
Yes — this crankcase is a direct foundation replacement for those engine platforms on 2006-2017 Dyna models.
