The 340 is the high-performance member of the LA small-block family. In 1970, in the AAR 'Cuda and T/A Challenger only, it was fitted with three two-barrel Holley carburetors on an Edelbrock aluminum intake (a small-block analogue to the V-code Six-Pack); in every other 1970 application it ran a single four-barrel. Either way the engine made 275 horsepower gross at 5,000 rpm and 340 lb-ft of torque at 3,200 rpm.
The 340 has a reputation among enthusiasts that exceeds what its rated numbers suggest. It is light, revs cleanly to 6,500, and holds tune; in cars where weight matters more than displacement, it can outrun many big-block configurations.