SBC Billet Main Caps - 4-Bolt Replacement

The SBC Billet Main Caps - 4-Bolt Replacement by Howards Racing Components are designed for small-block Chevrolet builders who prioritize block durability and reliability during high-RPM operation. These precision-machined billet caps are intended to replace factory cast iron components, making them suitable for 350 cubic-inch engines used in racing, street performance, or endurance applications.

Manufactured from high-quality billet aluminum, these main caps provide enhanced clamping load distribution and reduce the deflection and micro-cracking commonly associated with cast OEM caps. The 4-bolt design increases structural rigidity by securing the main cap to the block at four points per saddle, which helps maintain precise bearing clearances under peak cylinder pressures.

Engine builders and enthusiasts who are increasing displacement, using forced induction, or revving beyond 6,500 RPM will find significant advantages in upgrading to these billet caps. Proper installation requires line-boring and alignment work to ensure exact bearing bore concentricity, making them a critical component for high-performance engine builds.