Will a bell housing off Chevy sb fit big block?

A bell housing for a small block Chevy (SBC) will not mate to a big block Chevy (BBC) engine. While both engines share the same basic block design, the BBC is taller than the SBC and has a different bolt pattern.

The bell housing is a critical component in mating an engine to a transmission, as it provides a sealed connection between the two. It is important to use a bell housing that is specifically designed for the engine you are using in order to ensure proper fitment and operation.