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the definition is simple. larger dimensions, both internally and externally.
GM had a cubic inch cap with the original "muscle cars" of 400 CI. which is where the 396 came from, and the 389 pontiac. That was lifted in I think 1970 which is where the 454's came into play. They produce more torque just by size, but don't rev high like small blocks by nature, but they can be made to rev just as high or higher than small blocks. There are currently alot of small blocks produced to big block "size", like the 427's, and some 454's. If you took an older 400 small block chevy engine and bored it .030 over, you'd get a 406, and that can be made to run realy strong with the characteristics of both engines, torque, and higher revving horsepower (good engine to build on a budget). hope that helps a little?
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