Description
Engineered for big-inch competition and high-displacement street builds, Callies forged 4340 steel crankshafts for the GM LS platform provide exceptional torsional strength, fatigue resistance, and rotating assembly reliability. Featuring a standard 1-piece rear main seal design and an aggressive 4.125" stroke, this crankshaft serves as the ideal foundation for reaching 427, 441, and larger cubic-inch displacements in aftermarket and standard-deck tall-sleeve LS blocks. Precision ground and micro-polished journals ensure maximum oil film retention and bearing durability under demanding racing loads.
| Specification | Detail |
|---|---|
| Engine Platform | GM LS Series (Gen III / Gen IV) |
| Material | Forged 4340 Steel |
| Rear Main Seal | 1-Piece Seal |
| Stroke | 4.125" (Long-Stroke Stroker) |
| Main Journal Diameter | 2.559" (Standard LS) |
| Rod Journal Diameter | 2.100" |
Features:
- Precision forged from high-tensile 4340 aircraft-quality steel for superior core toughness and fatigue resistance
- Extended 4.125" stroke geometry engineered to maximize cubic-inch displacement in high-output LS builds
- Compatible with standard 1-piece rear main seal GM LS series engine blocks
- Precision ground and micro-polished 2.559" main and 2.100" rod journals for optimal bearing life and oil control
- Counterweights profiled to ease the precision dynamic balancing process and control windage
- Built to endure high cylinder pressures in naturally aspirated max-effort, nitrous, and forced-induction combinations
Details
Shipping Information
- H12.00"