Crankshafts

Our “Pro Series” 4340 alloy steel crankshafts are available with many value packed and high-performance enhancing features for a wide range of domestic engine applications.

• Lightweight Design, 4340 Material: Manufactured from forged 4340 material and featuring lightened rod journals for optimized engine performance. Counterweights are fully profiled to ensure precise balance and stability.
• Rigorous Quality Assurance: Each crankshaft undergoes stress relief, shot peening, and 100% magnafluxing to meet our stringent quality standards.
• Enhanced Strength: A multi-step heat treatment process and nitriding enhance the crankshafts’ strength and longevity.
• Micro-Polished Journals: Large radius journals are micro-polished to reduce friction and enhance performance.

For High Horsepower/High Boosted Applications, explore our fully machined “Turbo Tuff Series” billet cranks, available for Mitsubishi 4G63/4G64 and Subaru EJ20/EJ25 engines.

• Lightweight Design, 4340 Billet Material: Manufactured from 4340 Turbo-Tuff Billet material, ensuring durability and performance. Counterweights are fully knife edged to ensure precise balance and stability.
• Increase Displacement with a Stroker Crankshaft: Featuring an increased 94mm stroke provides a 9.3% increase over the stock stroke offering more displacement and more power.
• Rigorous Quality Assurance: Each crankshaft undergoes stress relief, shot peening, and 100% magnafluxing to meet our stringent quality standards.
• Enhanced Strength: A multi-step heat treatment process and nitriding enhance the crankshafts’ strength and longevity.

For High Horsepower/High Boosted Applications, explore our fully machined “Turbo Tuff Series” billet cranks, available for Mitsubishi 4G63/4G64 and Subaru EJ20/EJ25 engines.

• Lightweight Design, 4340 Billet Material: Manufactured from 4340 Turbo-Tuff Billet material, ensuring durability and performance. Counterweights are fully knife edged to ensure precise balance and stability.
• Increase Displacement with a Stroker Crankshaft: Featuring an increased 94mm stroke provides a 9.3% increase over the stock stroke offering more displacement and more power.
• Rigorous Quality Assurance: Each crankshaft undergoes stress relief, shot peening, and 100% magnafluxing to meet our stringent quality standards.
• Enhanced Strength: A multi-step heat treatment process and nitriding enhance the crankshafts’ strength and longevity.

Manley Turbo Tuff® Billet Crankshafts deliver uncompromising strength, precision, and reliability for high-horsepower and high-boosted applications. Machined from premium 4340 Turbo Tuff® billet material, each crank features gun-drilled pins and fully knife-edged counterweights for reduced weight and superior balance. A multi-step heat treatment and nitriding process maximize durability, while stress relief, shot peening, and 100% magnaflux inspection ensure flawless quality.
Manley Crankshaft, CRANK-4340 75mm STROKE.

• Enhanced Strength: Heat-treated and nitrided for max durability
• Counterweights knife-edged for precise balance and stability
• Quality Assured: Stress-relieved, shot-peened, magnafluxed
• Direct Shot Oiling for reliable bearing and journal life

Manley Turbo Tuff® Billet Crankshafts deliver uncompromising strength, precision, and reliability for high-horsepower and high-boosted applications. Machined from premium 4340 Turbo Tuff® billet material, each crank features gun-drilled pins and fully knife-edged counterweights for reduced weight and superior balance. A multi-step heat treatment and nitriding process maximize durability, while stress relief, shot peening, and 100% magnaflux inspection ensure flawless quality.
Manley Crankshaft, CRANK-4340 83.0mm STROKE
Manley Crankshaft, CRANK-4340 83mm STROKE.

• Enhanced Strength: Heat-treated and nitrided for max durability
• Counterweights knife-edged for precise balance and stability
• Quality Assured: Stress-relieved, shot-peened, magnafluxed
• Direct Shot Oiling for reliable bearing and journal life

Being the ‘Godfathers of K’, nobody has more experience with the Honda/Acura K-Series than Skunk2. Our years pushing the limits of the K-Series continue to make their way into Skunk2s products, allowing racers and enthusiasts the opportunity to enjoy race engineering and technology right off the shelf. This time around Skunk2 has created a lightweight and aero contoured 106mm Billet K Series Crankshaft. Skunk2 Crankshafts are made from the finest grade 4340 steel billet material for unmatched durability. The aerodynamic contoured counter weight design, gun drilled and CNC direct shot oil holes are what sets it apart from the other aftermarket or OEM crankshafts. The aero contoured counter weights design reduces windage and creates less oil resistance which in return produces horse power gains. The Gun Drilling lightens the total weight of the crank and adds strength, the direct shot oil holes create priority oiling all are advantages that impact track performance. Nitride, surface finish and exacting tolerances make for the best bang for the buck crankshaft.
Stroker Crankshaft; 108mm; GSR Journals; Contoured Counterweights To Reduce Drag; Gun Drilled; Direct Shot Oil Holes; 4340 Steel Billet; Honda/Acura K-Series Engines;

• Honda/Acura K-Series Engines
• GSR Journals
• 108mm Crank

Being the ‘Godfathers of K’, nobody has more experience with the Honda/Acura K-Series than Skunk2. Our years pushing the limits of the K-Series continue to make their way into Skunk2s products, allowing racers and enthusiasts the opportunity to enjoy race engineering and technology right off the shelf. This time around Skunk2 has created a lightweight and aero contoured 106mm Billet K Series Crankshaft. Skunk2 Crankshafts are made from the finest grade 4340 steel billet material for unmatched durability. The aerodynamic contoured counter weight design, gun drilled and CNC direct shot oil holes are what sets it apart from the other aftermarket or OEM crankshafts. The aero contoured counter weights design reduces windage and creates less oil resistance which in return produces horse power gains. The Gun Drilling lightens the total weight of the crank and adds strength, the direct shot oil holes create priority oiling all are advantages that impact track performance. Nitride, surface finish and exacting tolerances make for the best bang for the buck crankshaft.
Stroker Crankshaft; 106mm; 33.5 lbs.; GSR Journals; Contoured Counterweights To Reduce Drag; Gun Drilled Direct Shot Oil Holes; 4340 Steel Billet; Honda/Acura K-Series Engines;

• Crank Weighs 33.5lbs In Comparison To Stock Crank 38-40lbs
• GSR Journals
• 106mm Crank