[Carroll DeWeese]

The line to me is still a blur between sb and bb. I recognize that a 351W is still called a sb and a a 427 is still a bb no matter what cubes on the inside. This bothers me. When an engine is significantly modified (e.g. stroked), it is no longer the same engine. If it is not cubes, what makes an engine a bb or sb other than the original manufacture definition for the block? What design elements distinguish the two classes of engines?

Based upon the comment that bb are used in "truck" applications, does the following hold in reference to Cobras?
-- bb are for the Cobra truck guys
-- sb are for the Cobra car guys
Only if the world was so simple.