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.
LS based GM small-block engine
Dubbed EcoTec3 is a Generation V small block V8 truck engine.(VIN Code "C") Like its Vortec 5300 Generation IV predecessor, it gets its displacement from bore and stroke of with a compression ratio of 11.0 to 1.