Chevrolet small-block engine
In 1992, GM created a new-generation small-block engine called the "LT1 350", not to be confused with the high-output Generation I LT-1 of the 1970s. It displaced , and was a 2-valve pushrod design. The LT1 used a reverse-flow cooling system which cooled the cylinder heads first, maintaining lower combustion chamber temperatures and allowing the engine to run at a higher compression than its immediate predecessors.
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.