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vilebrequin: according to altavista babelfish: crankshaft. This is the long casting, forging or billet machined component in the lower end of the engine that the connecting rods are attached to.
Push-rods: Long rods that actuate the valve in a camshaft-in-block engine. In most older American V8 motors, the cam shaft resides within the engine block just above the crankshaft. Long hollow, oil-bearing rods are used to reach from the camshaft through the engine head to rocker arms that in turn actuate the valves.
small block: a small block engine is typically referring to smaller displacement American V8 push rod engines ranging from 265 cubic inches (4.3 liters) to just over 350 cubic inches (5.7 liters). There have been a few 400 cubic inch (6.0 liter) small block engines.
Big Block: a big block engine is typically referring to larger displacement American V8 push rod engines ranging from 390 cubic inches (6.0 liters) to beyond 600+ cubic inches (1000+ liters).
DOHC: refers to a Dual Over Head Cam. Where the two cam reside in the engine head(s) and actuate the valve in a mroe direct fashion and typically without pushrods. Some engines use a SOHC, or Single Over Head Cam setup operating in a similar fashion to the DOHC.
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