![]() The abundance of LM7 engines available helps keep prices down. GM made a bazillion of them over eight years.With iron block strength, it is a great choice for boost or nitrous applications.The LM7 is one of the most popular LS engines for several reasons: This article is focused on the power-adder pathway for upgrading the LM7, whether it will remain in a truck or be swapped into a car. These engines started life in GM trucks, but there’s just as much of a chance today that you’ll spot them under the hood of a turbocharged drag car. Because of their strength, these engines are likely to see a power-adder sooner than later. Although the iron block LM7 is a bit heavier, you can really pour the coals to it. The aluminum blocks made good power naturally aspirated, but they aren’t the best choice with big boost and nitrous. With the availability of engine swap kits, it just makes good sense to use Gen. The later 2004-07 versions were right there with the C4 Corvette’s LT1. Even bottled up and 25 cubic inches smaller, it matched the power and torque of the F-body LT-1’s. ![]() I/II engines and easier to find one in good shape. There were a couple key areas where the LM7 excelled:įully dressed, it’s a bit lighter than Gen. III, 5.3L iron block truck engines you can pick up in wrecking yards for about $600. The LM7 (along with its L59 FlexFuel E85-capable brother) are the Gen. Meet the hidden gem that helped start the LS-swap craze.
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