S&S Cycle V80 Evolution Long Block Engine for 1984-1999 Harley-Davidson Big Twin
Stop nursing a worn-out stock engine and put real power back under you. The S&S Cycle V80 long block drops directly into your Big Twin chassis, giving you noticeably stronger throttle response and more confident power delivery — all without the time, cost, and uncertainty of a full engine rebuild.
Key Features
- Direct drop-in replacement for Evolution Big Twin chassis — no frame modification required
- Retains your existing intake manifolds, throttle body, and air cleaner for simplified installation
- Compatible with carbureted applications using your existing carburetor — re-jetting required for proper fueling
- EFI-compatible with aftermarket calibration module or add-on tuner — calibration required
- S&S 585 valve springs and forged rocker arms included for high-performance valve train reliability
- Specially machined cylinder heads accept stock-length intake manifolds
- Available in Natural and Black finish
- Made in the USA
- Two-year warranty
Technical Specifications
- Displacement: 80 cubic inches (V80)
- Engine Type: Evolution-pattern V-twin long block
- Valve Springs: S&S 585
- Rocker Arms: Forged
- Primary Compatibility: Alternator-style Evolution primary
- Finish Options: Natural, Black
- Dimensions (L x W x H): 26.5″ x 24.56″ x 20.06″
- Fuel System: Not included — carbureted or EFI (calibration required)
- Ignition System: Not included
- Warranty: Two years
- Origin: Made in USA
- Emissions: Not legal for sale or use in California on pollution-controlled motor vehicles. Not legal for sale or use on any EPA pollution-controlled motor vehicle.
Fitment Notes
- Fits all 1984-1999 Harley-Davidson Evolution Big Twin chassis including Softail, FXR, Dyna, and Touring platforms
- Also compatible with custom frames designed for alternator-style Evolution primary, 1970-1999
- Fuel and ignition systems are not included — use existing carburetor, air cleaner, and aftermarket ignition
- Re-jetting of existing carburetor is required for carbureted applications
- EFI applications require an aftermarket calibration module or add-on tuner
- Review the Fitment tab for a complete year and model breakdown
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