302-351W Crank Pulley Spacer 0.875in

The 302-351W Crank Pulley Spacer 0.875in is a precision-engineered aluminum component designed for small block Ford engine builds where crankshaft pulley offset and belt geometry require fine-tuning. This spacer addresses a critical need in high-performance and modified engine applications where factory pulley positioning doesn't align with aftermarket dampers, serpentine belt systems, or custom accessory drive configurations. Whether you're upgrading cooling capacity, installing a modern alternator setup, or dialing in a fully built short-block, this spacer ensures proper pulley-to-block spacing and eliminates belt tracking issues that can compromise both efficiency and component longevity.

Machined from aluminum and finished in natural (uncoated) form, this 0.875-inch thick spacer integrates seamlessly with 4-bolt balancer configurations common to small block Ford engines, including both 302 and 351W platforms. The 4.7 by 2.35 by 5.15-inch envelope is engineered to stack between the crankshaft snout and the pulley assembly without interfering with timing cover geometry or belt paths. Aluminum construction keeps parasitic weight minimal while offering sufficient rigidity to handle the torsional loads and centrifugal forces generated at operating rpm, making this spacer suitable for street performance, racing applications, and comprehensive engine rebuilds alike.

This spacer is essential for technicians and enthusiasts building or modifying 302 and 351W small block Ford engines where pulley offset cannot be achieved through factory hardware alone. Installation requires basic crankshaft access and familiarity with damper removal and pulley stacking procedures; it bolts directly using existing crankshaft fastener holes via the 4-bolt balancer mount pattern. Confirm compatibility with your specific damper design, belt routing, and water pump configuration before purchase to ensure the 0.875-inch offset delivers the precise clearance and alignment your engine bay demands.