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
The L99 V8 shared a cylinder bore with the but had a stroke compared to of the . The pistons used in the 4.3 L V8 were the same as the Vortec 5000's, but connecting rods were used to compensate for the shorter stroke. It was designated by the RPO code L99, and was introduced in the 1994 model year. This was the base engine used in 1994-1996 Chevrolet Caprice sedans, the 9C1 police package sedans, and the 1A2 special service station wagons. The L99 was not available in other vehicles.