Block Sleeve - SBC 4.125 ID x 5.625 Long

The Block Sleeve - SBC 4.125 ID x 5.625 Long by DART is a precision-engineered cylinder sleeve designed specifically for small-block Chevrolet engine rebuilds and performance modifications. This component effectively addresses cylinder wear, scoring, and damage, providing a reliable foundation for engine reconditioning without the need for complete block replacement. Whether restoring a vintage muscle car or upgrading a street engine, this sleeve meets the structural integrity demands of serious builders.

Manufactured to exacting tolerances, the Block Sleeve features a 4.125-inch inner diameter and a length of 5.625 inches, accommodating standard SBC bore specifications and piston configurations. DART's manufacturing process ensures concentricity and wall thickness consistency, which are critical for proper piston ring sealing and combustion pressure containment. The sleeve's cast-iron construction provides superior heat dissipation and thermal stability compared to aluminum alternatives, making it suitable for high-performance applications.

Enthusiasts tackling SBC engine rebuilds—from 283 to 400 cubic-inch combinations—rely on quality sleeves to restore worn or damaged cylinders without full block machining. This sleeve integrates seamlessly with standard small-block Chevrolet blocks, supporting a range of performance modifications. It is ideal for builders looking for a dependable solution to enhance engine longevity and performance.