S&S CYCLE V124 Long Block Engine — 124", 4-1/8" bore, 4-5/8" stroke – 84-86 Big Twin, 84-98 Touring, 85-99 Softail, 91-99 Dyna, 85-94 FXR, 99 CVO

The V124 Long Block is a turnkey performance long block built for Evolution Big Twin and compatible custom frames from the 1970s through the 1990s. 🔧

Specially machined S&S cylinder heads allow use of a stock-length manifold, and the unit accepts your existing carburetor with proper re-jetting.

Designed to bolt into stock or aftermarket EFI, carburetor, or air cleaner setups, the crank and case are machined for a crank position sensor for modern ignition systems.

Includes S&S cylinder heads, S&S valve springs, forged rocker arms, a 640 cam, three-piece flywheel assembly, forged pistons, a high-volume high-pressure oil pump, and electric compression releases.

Made in the USA; installation will require a performance ignition and a performance carburetor for optimal results. 🇺🇸