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.
GMC V8 engine
Beginning in 1999, GMC began offering GM's third-generation "small-block" V8 engine in various models. Through the years, engines have been offered in 4.8, 5.3 and 6.0 liter displacements. Most of the LS- or LT-based truck engines feature cast-iron cylinder blocks and heads for improved durability.