What makes a Small block a Small block and a Big Block a big block?

[PKRWUD]

As a footnote, there is also always forced induction. People often misunderstand exactly what a blower does. It's really rather simple. It does one thing, and one thing only, and that is to increase the displacement of an engine. What's cool, is that it can do it to any engine, without changing the bore and/or stroke. For example, at sea level, a 302 that has a blower actually has 604 cubic inches of displacement when that blower reaches 14.7 pounds of boost (14.7 psi is the atmospheric pressure at sea level).

Take care,
-Chris