4340 Billet Crank Noonan 4.9 Hemi - 4.000 Stroke

The 4340 Billet Crank Noonan 4.9 Hemi - 4.000 Stroke is a forged rotating assembly component engineered for high-displacement Hemi engine builds and competition applications. This billet crankshaft is designed for builders who demand reliability in extreme power scenarios—whether you're constructing a stroker engine for drag racing, marine use, or supercharged street applications. The 4.9-liter displacement designation reflects the extended stroke geometry, making this crank essential for builders targeting maximum cubic inches and low-end torque production without sacrificing durability.

Manufactured from premium 4340 alloy steel, this billet crank offers superior material integrity compared to cast alternatives, with improved fatigue resistance at elevated RPM and boost levels. The 4.000-inch stroke geometry increases piston dwell at top dead center, enhancing fuel burn efficiency and generating substantial low-range power delivery critical for acceleration events. Billet construction eliminates the porosity and grain-structure inconsistencies inherent in casting, ensuring uniform strength throughout the entire rotating assembly and providing confidence for forced-induction and nitrous oxide applications that demand absolute reliability.

This crankshaft is ideal for Hemi engine enthusiasts building 426 Hemi or 440 Hemi variants with stroker upgrades, as well as modern 5.7L/6.2L Hemi platform builders pursuing maximum displacement. Installation requires compatible pistons, rods, and block modifications to accommodate the extended stroke, making this a core component requiring professional engine machine work. The 85.63-pound weight reflects the solid-steel construction, and precise machining ensures compatibility with OEM and aftermarket Hemi engine blocks when paired with appropriate connecting rod and piston combinations. Verify stroke length and rod requirements before ordering to ensure proper engine geometry and clearance.