Callies Magnum SBC Crankshaft

Callies Magnum SBC Crankshaft

Built for big performance and long life, the Callies Magnum crankshaft is your go-to for high-output Small Block Chevy builds. When you want strength, precision, and track-proven durability in one package, this crank checks all the boxes.

Specs & Features:

-Stroke: 3.480" to 4.000″ – ideal for small block Chevy combos from 350-440 ci

-Rod Journal Diameter: 2.100″

-Main Journal Diameter: 350 main (≈ 2.448")

-Rear Main Seal: 2-piece style

-Material & Treatment: Premium 4340 forged steel, Ultra-Case nitride hardened, with gun-drilled mains and fully profiled counterweights to reduce rotating mass

-Balance: Internal balance – smoother operation at high RPM

-Application: Small Block Chevy (350 mains), builds using 6.000″ or longer rods

Why It’s a Winner:
This crankshaft is built for the kind of abuse that kills lesser rotating assemblies. Whether you’re turning up the boost, adding nitrous, or pushing high RPM’s, Magnum cranks stay straight, balanced, and reliable. The combination of hardened surfaces, precision machining, and mass-correct counterweights means less bearing wear, and durability you can count on.

Siebert Performance Tip: Match this crank with Callies Ultra rods and Wiseco forged pistons for a rotating assembly that’s proven to win.