Harley Assembled Engines

The S&S Cycle T124LC Series delivers 124 cubic inches of displacement with a user-friendly 10.2:1 compression ratio—ideal for street-driven big twins that demand serious torque without sacrificing reliability across varying fuel qualities. This long...

If you're building a custom Harley-Davidson with 1970–1999 alternator-style chassis, the S&S P93 delivers authentic panhead aesthetics paired with modern engineering that actually runs hard. This 93-cubic-inch engine combines retro styling from the...

Rebuilding an aging 80" Evolution engine wastes time and money when you can drop in a completely new long-block with modern S&S engineering and immediately reclaim reliable power. This bolt-in replacement uses your existing carburetor and ignition setup,...

Rather than sinking time and money into rebuilding an aging 80" Evolution engine, the S&S Cycle V80 Series delivers a complete, factory-fresh replacement that bolts directly into your 1984–'99 Harley big twin chassis. You'll gain measurable power gains...

The S&S SH93 is a fully-assembled, turnkey 93-cubic-inch engine built specifically for 1970–84 Harley-Davidson big twins. If you're restoring a classic or building a retro custom, this engine eliminates the guesswork of sourcing individual...

The S&S Cycle V111 Long-Block Engine delivers a genuine +30% power increase over stock while maintaining reliability through a short-stroke design that reduces vibration and extends engine life. Its compact height makes installation straightforward on...

The S&S Cycle V80R Series delivers genuine big-inch power without requiring custom fabrication or frame modifications. Built with S&S forged internals and a proven 10:1 compression ratio, this 80-cubic-inch engine produces reliable horsepower and torque...

The S&S Cycle V96R Series delivers 96 cubic inches of displacement without requiring frame modifications or custom fabrication—bolt it into your Harley and gain immediate performance gains. With S&S forged internals, a refined 520 camshaft, and a 10.1:1...

If you're looking to extract real performance gains without the complexity and expense of a full big-inch build, the S&S V80 Series delivers measurable horsepower and torque in a drop-in package. You get the engineering of a purpose-built performance...

If you've already invested in performance upgrades for your big twin, the S&S Cycle T124 Series Engine lets you preserve those modifications while stepping up to 124 cubic inches of displacement. This long-block engine eliminates redundant fuel and...

If you've already invested in performance upgrades for your stock engine, the S&S Cycle T111 Long Block lets you preserve those investments while stepping up to genuine big-inch power. This complete engine assembly delivers the displacement and...

The S&S Cycle T124 Series Long Block delivers genuine street performance with a 10.8:1 compression ratio and 124 cubic inches of displacement—purpose-built for riders who demand power without compromise. This is a complete engine platform for serious...

The S&S T124LC delivers genuine street-oriented performance without sacrificing reliability across variable fuel quality and riding conditions. At 10.2:1 compression, this long block generates predictable, manageable torque that works exceptionally well...

The S&S Cycle T143 is the largest displacement engine S&S manufactures for stock Harley-Davidson touring chassis—delivering nearly double the horsepower of factory powerplants without requiring frame modifications. Built with CNC-machined components and...

If you're looking to unlock genuine performance gains on your 2007-'16 Harley touring bike without sacrificing reliability, the S&S Cycle T111 Long Block delivers 111 cubic inches of displacement with a forgiving 9.8:1 compression ratio that runs strong...

The S&S Cycle T143 Long-Block Engine delivers 143 cubic inches of displacement in a stock chassis—doubling the horsepower of factory big twins without frame modifications. Built for serious riders and racers who demand maximum performance, this...

The S&S Cycle T124HC Series engine delivers genuine big-displacement performance for Dyna models, combining a 10.8:1 compression ratio with purpose-built internals engineered for sustained high-output riding. This is a complete long-block solution that...

Upgrading from a stock engine means choosing between a tired rebuild or a purpose-built replacement—the S&S Cycle T111 Long-Block delivers measurable gains in horsepower and torque without requiring frame modifications or a complete electrical overhaul...

The S&S Cycle T124 Series engine delivers the displacement and compression ratio your build needs to compete on the street. Rather than nursing a tired stock engine along, this all-new long block gives you genuine power gains and the reliability of...

The S&S Cycle T124LC Series Long Block Engine delivers the low-end torque and reliability you need for street performance without sacrificing everyday rideability. At 10.2:1 compression, this 124-cubic-inch powerplant generates real-world horsepower and...