Main Bearing Spacer Set

The Main Bearing Spacer Set by Sealed Power is a precision engine component engineered for small block Ford applications, specifically designed to maintain proper crankshaft clearance and bearing alignment on 351 Cleveland cranks. This kit exists to correct and maintain critical main bearing spacing tolerances that directly affect engine longevity, oil pressure stability, and overall durability during both stock and modified operation. Any serious engine builder or mechanic working on vintage or performance Ford small blocks understands that bearing clearance is non-negotiable—even microns of error compound into accelerated wear and potential catastrophic failure.

Main bearing spacers work by distributing load evenly across the crankshaft's main journals and the block's bearing saddles, preventing shaft deflection and ensuring consistent oil film thickness under dynamic loads. Sealed Power's design incorporates precision machining to exacting tolerances, allowing proper seating and spacing without requiring shims or secondary adjustments during block assembly. The kit format means all necessary spacer components arrive pre-sorted and ready for installation, eliminating guesswork and reducing assembly time on the workbench.

This Main Bearing Spacer Set is essential for anyone rebuilding a 351 Cleveland small block Ford engine—whether you're restoring a classic Mustang, building a hot rod platform, or refurbishing an industrial or marine application. Installation requires the block to be prepped and the crankshaft positioned; spacers are positioned on the crank journals before bearing caps are torqued down. Proper installation combined with correct bearing clearance specifications ensures optimal oil pressure, reduced friction losses, and extended engine life under highway or high-performance driving conditions.