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The Manley Pro Series 4340 forged crankshaft is a replacement option for a wide range of domestic engine applications, built from non‑twist 4340 forging. Each crankshaft receives stress relief, shot peening and 100% magnaflux inspection, plus multi‑step heat treatment and nitriding for added strength. Large radius journals are micro‑polished to reduce friction and support consistent operation.
Manley Chevrolet Small Block Forged 4.000in Stroke Crankshaft
