Callies Magnum Big Block Chevy Crankshaft

Callies Magnum Big Block Chevy Crankshaft

For builds that demand top-tier durability and massive torque from the Big Block Chevy platform, Magnum crankshafts brings together strength, precision, and race-ready engineering. It’s designed to handle the abuse of big cubes and high horsepower setups with confidence.

Specs & Features:

-Stroke: 4.000" to 4.750” – ideal for high power BBC combinations from 454-632ci

-Main Journal Diameter: 2.750” – standard BBC main bearing size for compatibility and strength

-Rod Pin (Rod Journal): 2.200"

-Balance: Internal – helps with smoother operation at high RPMs and reduces vibration

-Rear Main Seal: 2-piece style

-Material & Treatment: Forged SAE 4340 steel; Ultra Case deep nitride heat treating. Journals lightened, mains gun-drilled, fully profiled counterweights with windage edges for reduced drag

Why This Crank Stands Out:
Whether you're pushing for big horsepower on the strip, building a displacement monster for bracket racing, or need a foundation for boosted or nitrous-assisted power, the Magnum line offers the iron-clad reliability you need. These crankshafts are built to survive grueling abuse, maintain its strength under load, and hold tight tolerances round after round.

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