Engine Block BBC 454 4.250 Bore 9.800 DH

The Engine Block BBC 454 4.250 Bore 9.800 DH from Chevrolet Performance is a bare block foundation engineered for serious builders who demand legendary Mark IV / Gen VI Big Block Chevy power. This block serves as the core component for custom engine builds in performance vehicles, marine applications, and high-output industrial equipment where displacement and torque are critical. Whether rebuilding a classic muscle car or constructing a dedicated drag engine, this bare block is designed for high performance.

Cast from durable iron, the Engine Block BBC 454 features a 4.250-inch bore diameter and a 9.800-inch deck height—specifications that define the BBC (Big Block Chevy) family and enable the 454 cubic inch displacement. The block utilizes four-bolt main bearing caps, which are the gold standard for high-rpm durability and crankshaft retention under extreme loads, and accommodates a one-piece rear main seal for reliability and reduced oil leakage. This substantial casting is engineered to withstand serious horsepower, reflecting the generous water jackets, oil galleries, and bore spacing characteristic of BBC engineering.

Builders undertaking 454 Big Block builds—from street performance to full competition—rely on this block for its precision and strength. Its design allows for optimal cylinder wall thickness and thermal management, making it suitable for a variety of high-performance applications. Whether you are a seasoned builder or a newcomer to engine construction, this block provides the foundation needed for exceptional performance.