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5.3 - Remanufactured

5.3 L

The Vortec 5300, or LM7/L59/LM4/L33, is a V8 truck engine. It is a longer-stroked (by 9 mm (0.35 in)) version of the Vortec 4800 and replaced the L31. L59 denoted a flexible fuel version of the standard fuel LM7 engine. Displacement is 5.3 L (5,328 cc (325.1 cu in)) from 96.01 mm 3.78-inch (96 mm) bore and 92.00 mm (3.6 in) stroke 3.622-inch (92.0 mm) stroke. Vortec 5300s are built in St. Catharines, Ontario and Romulus, Michigan. Another engine variant, the L33, shares the same displacement, but has an aluminum block with cast in cylinder liners, much like the LS1. This allowed a 100 lb (45 kg) weight savings over the standard LM7 model. Other differences were a higher lift cam shaft (0.482" v. 0.456" on both intake & exhaust), higher compression ratio (9.9:1 v. 9.49:1), and used cylinder heads originally designed for the LS6. These differences bumped output: GM rated the engine at 315 hp (235 kW) and 338 lbf·ft (458 N·m). This engine was used only in extended cab, short bed

LM7

The Vortec 5300 LM7 (VIN code 8th digit "T") was introduced in 1999, and can be considered the "garden variety" version of the Generation III 5.3 liter V8's. The 1999 LM7 engine produced 270 hp (201 kW) and 315 lb·ft (427 N·m), 2000-2003 engines made 285 hp (213 kW) and 325 lb·ft (441 N·m). The 2004-2007 engines made 295 hp (220 kW) and 335 lb·ft (454 N·m), it has a cast iron block and aluminum heads.

LM7 applications:

L59

The Vortec 5300 L59 (VIN code "Z") is a flexible fuel version of the LM7. The 2002-2003 made 285 hp (213 kW) and 320 lb·ft (434 N·m), while the 2004-2007 L59s made 295 hp (220 kW) and 335 lb·ft (454 N·m).

L59 applications:

LM4

The Vortec 5300 LM4 (VIN code "P") is an aluminum block version of the LM7, and had a short production life. The LM4s made 290 hp (216 kW) and 325 lb·ft (441 N·m), It should not be confused with the L33 which is the aluminum version.

LM4 applications:


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