Center Main Caps - SBM 2-Bolt

The Center Main Caps - SBM 2-Bolt from PRO-GRAM ENGINEERING are essential internal engine components designed for small-block motorsports engines requiring robust main bearing support. These caps serve as the foundation of your engine's bottom end, securing the crankshaft and distributing loads during high-RPM operation. They are ideal for rebuilding street performance engines, preparing for track duty, or restoring classic muscle car platforms.

The SBM 2-bolt configuration indicates a traditional two-bolt fastening pattern that secures the cap to the engine block, a proven design used across generations of small-block engines. PRO-GRAM ENGINEERING manufactures these caps to precise tolerances, ensuring proper journal alignment and minimal bearing wear during operation. The 2-bolt design is lighter and more cost-effective than later 4-bolt variants, making them suitable for naturally aspirated applications up to approximately 500–600 horsepower.

Engine builders, machine shops, and enthusiasts restoring or modifying small-block platforms will recognize these caps as critical to bottom-end integrity. Proper installation requires adherence to torque specifications and alignment tools to ensure the crankshaft centerline remains true, preventing bearing binding and potential catastrophic failure. These caps are a reliable choice for those looking to enhance the performance and longevity of their engine builds.