S&S Cycle 84 Inch Stock Bore Stroker Kit for 1970-1984 Harley-Davidson Big Twin
The stock bore stroker approach is the Shovelhead builder’s most cost-effective path to more displacement – keep the stock cylinders, use the factory head bolt pattern, and let S&S engineering handle the rest. This 84 inch stroker flywheel kit installs in a Shovelhead engine with only minor crankcase and cylinder modifications that can be done with hand tools, making 84 cubic inches more accessible than any big bore alternative.
Key Features
- Dynamically balanced 4-1/2 inch stroke flywheel assembly for smooth high-RPM operation
- S&S heavy-duty connecting rods and mainshafts included
- Stock bore stroker design reuses factory cylinders – saves cost and maintains stock engine appearance
- Upgrades 74 inch and 80 inch Shovelhead engines to 84 cubic inches
- Minor crankcase and cylinder modifications only – can be accomplished with hand tools
- Made in the USA by S&S Cycle
Technical Specifications
- Displacement: 84 cubic inches
- Bore: 3-7/16 inches (stock)
- Stroke: 4-1/2 inches
- Flywheel Assembly: Dynamically balanced, complete with connecting rods and mainshafts
- Compatible Source Engines: 74 and 80 cubic inch Shovelhead
- Fitment: 1970-1984 Harley-Davidson Big Twins with Shovelhead engines
- Origin: Made in USA
Fitment Notes
- Fits 1970-1984 Harley-Davidson Big Twin models with Shovelhead engines
- Requires special pistons ordered separately depending on cylinder oversize
- Minor crankcase and cylinder modifications required – these can be completed with hand tools
- Review the Fitment tab for the complete year and model breakdown
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