- Converts stock engines to 124" for non-balanced Twin Cam models.
 - Complete kit with S&S heads, pistons, cams, tappets, pushrods, rocker arms, hardware and gaskets.
 - Made in the USA; EFI recalibration required. Fuel or ignition system not included.
 - Verify all clearances and assembly specifications before installation.
 
Engine
Active filters
Fits '70-'84 custom chassis with alternator-style primary; correct sprocket shaft length; accepts '66-'84 exhaust and intake systems; oil filter mount for generator location.
Replacement part for valve stem kits, designed for reliable sealing and easy installation.
Vintage-style S&S engine package for '70–'99 custom chassis, featuring Super Stock® components and generator-area oil filter mounting for straightforward installation.
Fits '84-'99 Harley-Davidson® big twin chassis and Evolution®-style frames. Up to 30% more HP and torque, short-stroke design for reduced vibration, shorter height for easier installation. Does not include carb or ignition.
Direct replacements for OEM oil lines. Compression and NPT fittings are chrome-plated. Made in the USA.
- Direct replacements for OEM oil lines
 - Compression and NPT fittings are chrome-plated
 - Made in the USA
 
Replacement parts for valve stem kits that provide a reliable seal and help prevent leaks.
High-compression T124 long block with Super Stock heads and TC3 oil pump. Fits stock-length intake manifolds; head machining compensates for non-stock cylinder length. No fuel or ignition systems included. Not compatible with Softail models.
Replacement parts for valve stem kits. Ideal for maintenance and repairs.
Comprehensive kit to upgrade a stock Shovelhead; includes cylinders, pistons, flywheel assembly, rods, pushrods, gaskets and a heavy-duty top motor mount.
Complete bolt-in engine performance kit from S&S. Includes cylinders, piston kits with pins and clips, Easy Start® cams, Quickee pushrods, TC3 cam support plate and oil pump, and precision hydraulic tappets. Made in USA. Not for '06 Dyna; '99–'04 Twin Cams need separate valve spring kit.
Long block engine with Super Stock™ heads and stock-style breathing; does not include fuel or ignition components.
High-performance S&S T143 long block with CNC-machined B3 heads and Super Stock T2 crankcases. Does not include carburetor, intake, or ignition; exhaust required.