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The LA engine (light or low A engine) was an evolution of the small-block Chrysler A engine. It continues through this day in the form of the Dodge Viper V10, 3.9 liter V6, and 5.2 liter and 5.9 liter V8. All LA engines are pushrod OHV designs and use a 90-degree V block. All are cast iron, except for the Viper V10, which is aluminum. LA engines have same bore spacing as the A family.
The 273 A (4.5 liter) was the first LA engine, debuting in 1964 and retiring in 1969. It had a 3.62 in (92 mm) bore and 3.31 in (84 mm) stroke.
The 273 was used in:
The 318 A (5.2 liter) was bored out to 3.91 in (99 mm). It appeared shortly after the 273, in 1966, and proved tremendously successful. An evolution of this engine, the 5.2 is still sold today.
This engine was used in the following vehicles:
The 340 A (5.6 liter) appeared in 1968 and was retired in 1973. It was bored out to 4.04 in (103 mm) 318 with higher-flow heads.
This engine was used in the following vehicles:
The 360 A (5.9 liter) is version of the A block bored and stroked to 4.00 by 3.58 in (102 by 91 mm). It appeared in 1970, and is still sold today as the Magnum 5.9.
This engine was used in the following vehicles:
The Magnum 5.2 is an evolution of the 318. It became a Magnum V8 with new manifolds and heads in 1992.
The Magnum 5.9 is an evolution of the 360. It became a Magnum V8 with new manifolds and heads in 1993.
The 3.9 V6 is a 318 with two cylinders removed. It debuted in 1987.
The Viper V10 is loosely based on the rest of the LA family, and appeared with the Dodge Viper in 1992. It can be thought of as a Magnum 5.9 with two extra cylinders and a longer stroke of 3.88 in (99 mm). The second-generation 2004 Viper continues to use this engine, now with 500 hp.
The same basic design as the Viper V10, but executed in cast iron, appeared in 1994 and was retired in 2002 in favor of diesel V8s. It was used in Dodge trucks and is called the Ram Tough V10.
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