SBC 4340 Forged Magnum Crank - 4.000 Stroke

The SBC 4340 Forged Magnum Crank by Callies is engineered for serious small-block Chevrolet performance builds where durability and reliability cannot be compromised. Whether you're assembling a high-revving street engine, a competition drag car, or a turbocharged road race platform, this forged crank forms the backbone of your rotating assembly. Callies has established itself as the gold standard for forged crankshaft manufacturing, and this 4.000-stroke offering delivers the strength needed to handle extreme boost, nitrous, or naturally aspirated horsepower without risk of catastrophic failure.

Machined from 4340 alloy steel and precision-forged using proprietary techniques, the SBC 4340 Forged Magnum Crank resists fatigue cracking and twisting under extreme loads that would snap a cast-iron unit. The 4.000-inch stroke is ideal for builders targeting mid-range torque and displacement without excessive bore sizing, making it compatible with standard small-block deck heights and common rod lengths. Full-radius fillets, optimized journal sizing, and premium surface finishing ensure minimal stress concentration and maximum service life across thousands of high-power cycles.

Mechanics and engine builders favoring long-block reliability over budget corners spec this crank for engines intended to run sustained power levels above 600 horsepower or for applications requiring repeated dyno pulls, endurance racing, or forced induction. It integrates seamlessly with Chevrolet small-block pan geometry and accepts standard 7/16-inch fasteners and damper hardware. Installation demands proper balancing with your specific pistons and rods, along with precision honing of main bearing saddles—professional machine shop setup is strongly recommended to maximize longevity and performance.