Manley 190140 Pro Series 4340 Forged Steel Crankshaft 4.250" Stroke

The Manley 190140 Pro Series Crankshaft is a premium 4340 forged steel crankshaft featuring a 4.250-inch stroke, engineered for serious high-performance and competition engine builds. Manley's Pro Series crankshafts are designed to handle the extreme loads generated by forced induction, nitrous, and naturally aspirated high-horsepower applications where OEM and lesser aftermarket crankshafts simply cannot compete.

Key Features:

• Manufactured from premium 4340 chromoly steel for exceptional tensile strength and fatigue resistance
• 4.250-inch stroke for increased displacement and torque output
• Precision CNC-machined journals for tight tolerances and optimal bearing life
• Fully forged construction provides superior grain structure compared to cast alternatives
• Heat-treated and micro-polished journals for smooth operation and extended bearing life
• Nitrided surface hardening for outstanding wear resistance under extreme loads
• Cross-drilled and chamfered oil holes for improved lubrication to all journals
• Shot-peened for enhanced surface strength and fatigue life
• Dynamically balanced for smooth, high-RPM operation

Manley Performance has been a trusted name in professional racing and high-performance engine building for decades. The Pro Series 190140 crankshaft is built to meet the demands of drag racing, road racing, and street/strip applications where maximum durability and performance are non-negotiable. Ideal for engine builders looking to maximize displacement and power output in their builds.