Mandrel 3.250 SBC Alum

The Mandrel 3.250 SBC Alum from Peterson Fluid is a precision crankshaft mandrel engineered for Small Block Chevy (SBC) engine builders, machine shops, and restoration specialists who demand accuracy during crankshaft preparation and balancing operations. This aluminum mandrel serves as a critical centering tool that ensures proper alignment of the crankshaft during machining, grinding, and polishing processes. Whether you're rebuilding a classic small-block or preparing a performance engine, a high-quality mandrel eliminates runout errors that can compromise engine balance and longevity.

Manufactured from aluminum with black anodized finish, this 3.25-inch mandrel resists corrosion while maintaining dimensional stability on precision grinding equipment. The anodized coating provides durability during repeated use in machine shops without compromising the mandrel's accuracy or surface finish. At just 0.32 lbs and compact 2.2 x 1.55 x 6.1-inch dimensions, the mandrel is easy to handle and store, yet robust enough for professional-grade crankshaft work. Peterson Fluid's engineering ensures concentricity within tight tolerances, allowing machinists to achieve balanced crankshaft geometry that reduces vibration and extends engine life.

SBC enthusiasts, machine shops, and engine builders working on 262, 283, 305, or 350 cubic-inch applications will find this mandrel indispensable for crankshaft reconditioning and dynamic balancing operations. The tool integrates seamlessly with lathe chucks, balancing machines, and grinding setups commonly found in professional shops. Installation requires no special preparation—simply mount the mandrel in your equipment's centering system and begin precise crankshaft work. For anyone serious about engine quality and performance integrity, this Peterson Fluid mandrel is the standard choice.