Top Harley-Davidson Crate Engines, Ranked by Power

There was a time when Harley-Davidsons were seen as "old man bikes" lagging behind the more agile Kawasakis and Hondas. However, with recent models like the Milwaukee-Eight 121 boasting some of the most powerful stock engines ever, that stereotype is a thing of the past. Harley's 2024 lineup features some of the fastest, top-performing heavyweights on the market today.

But the desire for more power is insatiable for many enthusiasts. Once you've maxed out the potential of a stock bike, what's next? Enter crate engines. These powerhouses fit right into the stock chassis, delivering a substantial performance boost. While Screamin' Eagle kits (from Stage I to Stage IV) are a reliable choice, numerous aftermarket options often surpass the manufacturer's upgrades. Let's explore some crate engines that can elevate your Harley to the next level.

Ultima 96" Shovelhead

  • Horsepower: 90 HP
  • Displacement: 96 cu (1,564 cc)
  • Max Torque: 95 lb-ft
  • Bore: 3.625"
  • Stroke: 4.625"
  • Compression: 9.5:1

Owning a Harley-Davidson Shovelhead already garners respect, but the Ultima 96-inch Shovelhead engine brings this classic model up to speed with modern bikes. With dual plug heads, compression releases, and a nostalgic yet upgraded exterior, this engine is available in all-chrome, fully blacked-out, or a combination of both, enhancing both performance and aesthetics.

S&S V111 Evo

  • Horsepower: 115 HP
  • Displacement: 111 cu (1,818 cc)
  • Max Torque: 122 lb-ft
  • Bore: 4.125"
  • Stroke: 4.125"
  • Compression: 9.8:1

The S&S V111 Longblock Evo engine, compatible with 1984 to 1999 models, is a high-powered alternative that saves you from the hassle of rebuilding an old engine. It offers a longer lifespan, fewer vibrations, and easier starting, making it a reliable upgrade for retro Harley enthusiasts.

S&S MK136 M8

  • Horsepower: 121.65 HP
  • Displacement: 136 cu (1,818 cc)
  • Max Torque: 145.41 lb-ft
  • Bore: 4.320"
  • Stroke: 4.625"
  • Compression: 11:1

Designed for 2017 and newer Harley Touring models, the S&S MK136 M8 is a powerhouse. With high-flow cylinder heads and +1 mm valves, this engine offers a significant boost in horsepower and torque, perfect for those who demand top-tier performance from their rides.

H-D Screamin' Eagle Milwaukee-Eight 131

  • Horsepower: 124 HP
  • Displacement: 131 cu (2,151 cc)
  • Max Torque: 135 lb-ft
  • Bore: 4.31"
  • Stroke: 4.5"
  • Compression: 10.7:1

The Screamin’ Eagle Milwaukee-Eight 131 is one of Harley's most powerful street-compliant engines, compatible with all Touring and select Softail models. Designed for aggressive, torque-heavy riding, it offers a significant performance boost with a straightforward bolt-in installation.

Ultima El Bruto Evo Big Twin 113

  • Horsepower: 125 HP
  • Displacement: 113 cu (1,851 cc)
  • Max Torque: 125 lb-ft
  • Bore: 4"
  • Stroke: 4.5"
  • Compression: 10.2:1

Nicknamed "El Bruto," the Ultima El Bruto Evo Big Twin 113 engine delivers 125 HP and remarkable performance. Constructed with C355 Aluminum, known for its stability and heat resistance, this engine is designed for those who crave power and durability.

S&S V124

  • Horsepower: 128 HP
  • Displacement: 124 cu (2,030 cc)
  • Max Torque: 130 lb-ft
  • Bore: 4.125"
  • Stroke: 4.625"
  • Compression: 10.8:1

The S&S V124 is built for racers and passionate riders, offering durability and power. Though it generates more vibrations, its high performance makes it a popular choice for those who prioritize speed and torque.

H-D Screamin' Eagle Milwaukee-Eight 135

  • Horsepower: 130 HP
  • Displacement: 135 cu (2,212 cc)
  • Max Torque: 143 lb-ft
  • Bore: 4.31"
  • Stroke: 4.625"
  • Compression: 10.7:1

The Screamin' Eagle Milwaukee-Eight 135 pushes the limits with the most displacement, horsepower, and torque in a street-compliant Harley crate engine. Designed for maximum performance, it transforms your Touring bike into a high-powered machine.

S&S T124 Long Block

  • Horsepower: 131 HP
  • Displacement: 124 cu (2,030 cc)
  • Max Torque: 133.5 lb-ft
  • Bore: 4.125"
  • Stroke: 4.625"
  • Compression: 10.2:1

For 2007 to 2016 Touring bikes, the S&S T124 Long Block engine offers a powerful upgrade. Its lower compression makes it more fuel-tolerant, and its custom-made cylinder heads fit seamlessly with a stock-length manifold or throttle body.

Ultima El Bruto 127

  • Horsepower: 140 HP
  • Displacement: 127 cu (2,080 cc)
  • Max Torque: 145 lb-ft
  • Bore: 4.25"
  • Stroke: 4.5"
  • Compression: 10.2:1

The Ultima El Bruto 127 delivers an impressive 140 HP and 145 lb-ft of torque. With CAD-designed castings and heat-efficient C355 Aluminum, this engine offers exceptional performance for those seeking a powerful upgrade.

S&S T143

  • Horsepower: 145 HP
  • Displacement: 143 cu (2,344 cc)
  • Max Torque: Not specified
  • Bore: Not specified
  • Stroke: Not specified
  • Compression: Not specified

The S&S T143 is the largest engine S&S offers that fits in a stock Harley chassis. With nearly double the horsepower of a stock H-D motor, this ultra-performance engine is ideal for professional racing, requiring expert installation and tuning.