Chrysler A engine
The Chrysler A engine is a small-block V8 gasoline engine built by Chrysler with polyspherical combustion chambers. It was produced from 1956 until 1967, when it was replaced by the wedge-head LA engine. It is not related to the hemispherical-head Hemi engine of the same era.
Chevrolet small-block engine
Crankshafts used with the 305 had the same casting number as the 350 with one discernable difference - the 305 crank is lighter in weight to compensate for engine balancing. (The counterweights are smaller, which makes it unsuitable for use in a 350 where metal would have to be welded back on.) The medium journal 305, like its big-brother 350, would be further developed in the 1990s, although with a reduced stroke (using connecting rods), into the "Generation II SBC" GM LT-Series engine L99 263.