2003-2004 Chevrolet Suburban 5.3L engine

Chevy Suburban VIN Z replacement motor, L59 Vortec 5300 complete engine, used Chevy 5.3L flex-fuel V8, GM Gen III 5.3 iron block engine swap

Looking to restore the heavy-duty towing power and legendary dependability of your full-size rig? This genuine OEM 2003-2004 Chevrolet Suburban 5.3L Engine is a proven workhorse ready for its next home. Sourced from a well-maintained passenger model with 147,000 original miles, this Gen III Vortec 5300 powerhouse balances relentless torque with exceptional long-term reliability.

This specific unit is the highly sought-after VIN Z (8th digit) platform, which designates it as the L59 Flex-Fuel variant of the legendary LM7 architecture. Built with a rugged, high-strength cast-iron block and lightweight aluminum cylinder heads, this small-block setup delivers up to 285–295 horsepower. It is engineered to comfortably handle daily commuting, heavy family hauling, or demanding towing tasks on either regular pump gas or E85 ethanol.

Every engine assembly undergoes careful inspection and testing for compression, core integrity, and operational functionality. It drops directly into your factory engine bay as a hassle-free, cost-effective replacement for your worn or failed factory motor.

Engine Quick Facts:

• Fits: 2003-2004 Chevrolet Suburban 1500 (Also fits matching era Tahoe, Yukon, and Silverado/Sierra 1500 platforms with VIN Z)

• Engine Code: L59 Vortec 5300 (Gen III LS-based architecture)

• VIN Code: VIN Z (Must match the 8th digit of your vehicle’s VIN number)

• Block / Head Material: High-durability Cast Iron Block / High-flow Aluminum Heads

• Factory Output: 285–295 HP / 320–335 lb-ft of Torque

• Mileage: 147,000 run-tested miles

• Condition: High-quality, tested OEM complete long block assembly

A Quick Tech Note for Accuracy: While some later-gen truck or car LS variants moved to aluminum castings, the 2003–2004 VIN Z (L59) uses a robust cast-iron engine block mated to aluminum heads. This heavy-duty iron block is exactly why these specific motors are prized by hot rodders and truck owners alike—it is practically bulletproof and handles high-mileage workloads without breaking a sweat.

Don’t settle for risky junkyard pull-outs or premium dealership pricing. Extend your truck’s lifespan with verified, reliable GM muscle. Message our team today with your zip or postal code for a fast, competitive shipping quote to the US or Australia!