S&S Cycle V124 Long Block Engine | Performance Harley Davidson Engine Upgrade (Evo Big Twin 1984–2000)

Harley Evo Engine For Sale | S&S Cycle Engines

Are you looking for a highly reliable, high-quality engine for your stock or custom motorcycle built in the USA? An S&S engine (S&S Cycle V124 Long Block Engine) is always a good choice! It’s a terrific sensation to open the box on a brand new engine with a carburetor and ignition and be ready to go! We are here to help you with any questions you have before or after you get your new powertrain for the dream bike you are building. Please get in touch with us if you have any questions, and we will respond straight away!

The S&S V124 engine is a performance option for people who don’t want to go “big inch.” The V124 fits in a stock frame just like a stock Harley-Davidson Evolution engine because it has the same size and displacement. However, it has more power because of the S&S Super E carburetor, S&S 508 camshaft, and high-flow S&S cylinder heads. The V80 is made from the same high-quality materials as S&S’s bigger performance engines, which means it will last a long time.

The Harley Davidson engine upgrade — S&S Cycle V124 Long Block — delivers unmatched performance and reliability for Evo Big Twin models (1984–2000). Engineered for riders who demand race-level power, this Harley performance engine transforms your bike into a torque-driven machine.

⚙️ High-Output Engineering

Built with precision-balanced components, the S&S V124 engine produces serious horsepower and torque gains while maintaining legendary reliability. Whether cruising highways in the US, touring the UK, or riding open roads in Australia or Canada, this Harley Evo engine upgrade guarantees consistent performance.

🔧 Durable Design for Classic Harley Models

This Harley Big Twin engine features forged pistons, a high-flow oil pump, and precision-machined cases. It’s a direct-fit replacement for Evo Big Twin models from 1984–2000, offering better cooling, smoother throttle response, and enhanced fuel efficiency.

S&S V124 Evo | S&S Cycle V124 Long Block Engine

The S&S Cycle V124 Long Block Engine is one of the most talked-about powerplants in the performance Harley-Davidson community — and for good reason. Designed to give big-bore torque, massive horsepower potential, and a beefy bottom end ready for aggressive riding, the V124 long block is a go-to platform for riders wanting maximum performance from their cruiser or bagger.

S&S Cycle is one of the most respected names in American V-twin performance engines and components. The V124 Long Block is a big-bore, high-performance engine package offered by S&S that pushes displacement to 124 cubic inches (≈ 2032cc) — far beyond stock configurations.

A long block engine generally includes the short block (crank, rods, pistons, cylinders) plus the cylinder heads, cams, and valvetrain — everything you need on the mechanical side to build a running engine core. You still need external components like the intake, ignition, exhaust, fuel system, and clutch to make the engine complete.

The S&S V124 Long Block is engineered to be a beefy “drop-in” platform for riders looking for serious torque and power gains over stock Harley-Davidson engines.

For Evolution Big Twins from 1984 to 1999 or special chassis from 1970 to 1999 with alternator-style primary
Because the cylinder heads are specially made, you can use a stock-length manifold and your current carburetor (you will need to re-jet it).

Built to fit stock or aftermarket EFI, carburetor, or air cleaner. The crank and case have been cut for the crank position sensor.
It comes with S&S cylinder heads, S&S valve springs, forged rocker arms, a 640 cam, a three-piece flywheel assembly, a 1.671-inch diameter crankpin, 0.927-inch wristpins, an electric compression release, a high-volume high-pressure oil pump, and forged pistons.

Notes: Made in the USA
Needs a performance starter and a performance carburetor.

It’s against the law in California to sell or use on any pollution-control cars. ONLY USED FOR OFF-ROAD RACE IN CA
**** Shipping costs depend on where you live, but are usually between $250 and $350. Call for a price, or you’ll be charged extra for shipping ****

Why Riders Choose the V124 Long Block

The V124 Long Block is not a stock replacement — it’s a performance upgrade targeted at riders who want:

• Huge low-end and midrange torque

• Increased horsepower potential

• A robust bottom end capable of handling aggressive riding

• A solid platform for further performance upgrades

• A distinct power advantage for touring, drag, or custom builds

For many big-twin owners, the thrill of a V124 lies in how dramatically it transforms throttle response and acceleration compared to a stock 107ci or 114ci Milwaukee-Eight.