BBC Main Cap

The DART BBC Main Cap is a 4-bolt ductile iron engine block cover engineered for Big Block Chevy applications. Finished in black oxide for corrosion resistance and durability, this main cap delivers the structural integrity and precision fit demanded by engine builders and high-performance enthusiasts working with BBC powerplants. The interior-mounted design ensures secure fastening while maintaining clean external aesthetics on finished engine bays.

Manufactured from ductile iron, this component offers superior strength characteristics compared to standard cast iron, critical for maintaining bore alignment under sustained high-RPM operation and thermal cycling. The black oxide finish provides a durable protective layer that resists surface oxidation and corrosion in engine compartment environments. The 4-bolt configuration ensures positive location and load distribution across the main bearing saddle, a specification that directly impacts bearing longevity and crankshaft stability in performance applications.

This main cap serves engine builders, restoration specialists, and performance engine shops working on Big Block Chevy engines where OEM-specification or OEM-equivalent components are required. Whether rebuilding a vintage muscle car engine, constructing a performance street engine, or restoring a classic automotive powerplant, the BBC Main Cap ensures proper main bearing support and block integrity. The interior mounting design is compatible with standard BBC block configurations and pairs with corresponding main bearing saddles for complete assembly.

DART's engine components are widely recognized in the automotive performance and restoration community for dimensional accuracy and material consistency. This main cap maintains the exacting tolerances necessary for proper bearing fit and crankshaft clearance in BBC applications, where precision in main bearing alignment directly affects engine reliability and performance longevity.