BBC Big M Iron Block - 9.800/4.600

The DART BBC Big M Iron Block with 9.800-inch deck and 4.600-inch bore is a complete bare engine block purpose-built for big-block Chevrolet performance and restoration applications. This iron casting provides the foundational platform for serious engine builders who demand structural integrity and proven reliability in high-displacement powerplants.

The 9.800-inch deck height and 4.600-inch bore dimensions define this as a full-size big-block platform, optimized for maximum displacement in street, racing, and restoration builds. The 4-bolt main fastener pattern delivers adequate clamping force for moderate to high-horsepower applications, while the iron construction ensures thermal stability and durability under sustained load. The 2-piece rear seal design accommodates both traditional and modern gasket materials, offering flexibility for restorations or performance rebuilds. At 250 pounds, the block represents the substantial mass characteristic of iron big-block castings, providing the mechanical advantage of inertial stability in high-rpm environments.

This block serves engine builders, restoration specialists, and performance enthusiasts tackling big-block Chevrolet projects where displacement and proven engineering take priority. Whether rebuilding a classic Chevelle, constructing a truck engine platform, or assembling a dedicated race powerplant, the BBC Big M block provides the core casting quality and dimensional accuracy required for balanced, reliable assembly. The iron composition maintains traditional characteristics prized in heavy-duty applications where longevity and heat dissipation outweigh weight considerations.