S&S Cycle V124 Evolution Long-Block Engine Fits Harley-Davidson Big Twin 1984-1999

S&S Cycle V124 Evolution Long-Block Engine Fits Harley-Davidson Big Twin 1984-1999

The V124 is the largest S&S Evolution-platform stroker engine – 124 cubic inches rated 128 horsepower and 133 pound-feet of torque per S&S, built to bolt into a stock 1984-1999 Evolution Big Twin chassis without frame modification. Three finishes give the build the visual to match.

Key Features

• Complete 124 cubic-inch Evolution stroker long-block – the largest S&S Evo-platform stroker
• S&S crankcases with large-displacement stroker flywheels
• 124 big-bore cylinders with S&S forged pistons
• S&S cylinder heads (Chrome on the Chrome/Black and Chrome/Natural variations), S&S camshaft, and hydraulic valvetrain
• Rated 128 hp and 133 ft-lb torque per S&S
• Available in all-Black Edition, Chrome with Wrinkle Black, or Chrome with Natural finish
• Designed to bolt into stock Evolution Big Twin chassis without frame modification per S&S

Technical Specifications

• Displacement: 124 cubic inches
• Rated Output: 128 hp / 133 ft-lb torque (per S&S)
• Crankcases: S&S
• Flywheels: S&S large-displacement stroker
• Cylinders: 124 big-bore
• Pistons: S&S forged
• Cylinder Heads: S&S (Chrome on Chrome/Black and Chrome/Natural variations)
• Camshaft: S&S
• Valvetrain: Hydraulic
• Country of Origin: United States

Fitment Notes

• Compatible with Harley-Davidson 1984-1999 Evolution Big Twin chassis across the Softail, FXR, Dyna, and Touring families, designed to bolt in without frame modification per S&S.
• Also compatible with custom frames built for alternator-style Evolution Big Twin engines.
• The larger stroker flywheels may require additional primary-side clearance on tight-clearance stock chassis applications – confirm fitment for your specific bike with S&S Cycle or your installer.
• Long-block scope: the installer supplies the carburetor or EFI, ignition, plus chassis-side primary, transmission, and exhaust.
• Refer to the Fitment tab for the full platform breakdown.
• Not affiliated with or endorsed by Harley-Davidson.