Description
Callies Durastar crankshafts are designed to be substantially stronger than OEM shafts found in GM’s popular Duramax diesel platform. Every crankshaft is 100% inspected for critical dimensions, with manufacturing equipment constantly monitored to eliminate tolerance drift and tool degradation. Engineered to deliver superior fatigue resistance and load capacity, the Durastar series provides an ultra-reliable foundation for performance and heavy-duty diesel applications.
| Specification | Detail |
|---|---|
| Engine Platform | GM 6.6L Duramax Diesel |
| Series | Callies Durastar |
| Material | Forged 4340 Through-Hardened Steel |
| Balance | External (Stock Damper & Flywheel) |
| Stroke | 3.898" (Stock Dimension) |
| Main Journal Diameter | 3.146" |
| Rod Journal Diameter | 2.477" |
| Damper Bolt Thread Size | M18 x 1.5 |
| Power Rating | Conservatively rated for 800 HP / 800 lb-ft torque |
Key Features:
- Precision machined from high-tensile 4340 through-hardened steel
- Finished with deep DuraCase nitride surface treatment for superior wear resistance
- Designed for external balancing utilizing factory stock damper and flywheel configurations
- Dual-keyed snout fit for aftermarket or pinned harmonic dampers
- Keyed shear-proof timing gear fitment (GM timing gears available separately)
- Large True Form fillet radii machined on all main and rod journals
- Gun-drilled rod journals reduce rotational inertia and facilitate precision balancing
- Retains OEM post, flange bolt, and flywheel/flexplate patterns
- Journals micro-polished to a smooth 6 Ra or finer surface finish
- Main oil holes feature teardrop lead-ins to ensure rapid oil flow to rod bearings during cold starts
Details
Shipping Information
- H12.00"
