Mar 1, 2018 · From cylinder heads to the camshaft, here's a complete rundown of all the vital engine specs you need for the 5.3L LM7 Vortec LS engine.

Jan 9, 2026 · The GM / Chevy LM7 is a 5.3 l (325 cu.in.) natural aspirated V8 90° four-stroke gasoline engine from a Generation III small block V8 truck engine series. The engine was manufactured in St. …

Introduced in 2002, this is simply an LM7 with Flex-Fuel specific injectors. I see these from time to time, but there really is no reason to prefer an L59 over a standard LM7 for aftermarket applications.

(Casting #12552216) In 2001, the LR4 and LM7 were upgraded with MLS gaskets. The L59 was first built after the upgrade. It always had MLS gaskets. The 1999-2003 LR4 and LM7 had a return-style …

The Vortec 5300 engine, or LM7/L59/LM4/L33, is a naturally-aspirated 5.3-liter gasoline V8 truck engine. The first member of the Vortec 5300 lineup, introduced in 1999, was the LM7.

Apr 27, 2023 · Hands down the most popular LS 5.3 junkyard build fodder is going to be an LM7 build. What’s an LM7? It is an iron block Gen 3 5.3 LS used in the 1999-2007 Chevy trucks, vans, and …

Mar 7, 2025 · The LM7 engine is one of the most reliable, affordable, and versatile LS-based engines available today. With its iron-block durability, solid horsepower output, and massive aftermarket …

Sep 5, 2022 · The LM7 5.3 Vortec engine has aluminum cylinder heads with an iron block and runs on gasoline. It has a 9.5:1 compression ratio and the heads use the LS-style cathedral intake ports and …

Feb 22, 2023 · The General Motors LM7 5.3 liter Vortec 5300 engine is a popular choice for many car owners, due to its power and performance. However, like all engines, it can experience problems …

Dec 1, 2010 · Like the previous generation of small-blocks, the LS family has its bread-and-butter motor in the form of the 5.3L (LM7). Rated at a low of 285 hp and 325 lb-ft of torque, the 5.3L combined an...