2005-2006 Chevrolet Silverado Sierra 1500 5.3L engine

Chevy Silverado VIN T Z replacement motor, GMC Sierra Vortec 5300 complete engine, used Chevy 5.3L V8 truck engine, GM Gen III 5.3 iron block engine swap

Looking to restore the hard-working towing power and legendary dependability of your half-ton truck? This genuine OEM 2005-2006 Chevrolet Silverado Sierra 1500 5.3L engine is the ultimate drop-in replacement. Sourced from a well-maintained truck with only 90,000 original miles, this low-mileage Gen III Vortec 5300 powerhouse balances heavy-duty capability with bulletproof long-term reliability.

This versatile engine assembly is fully verified for compatibility with VIN code T or VIN code Z (8th digit) configurations. Whether your truck requires the standard, ultra-reliable LM7 powertrain or the flex-fuel capable L59 platform, this engine package drops cleanly into your factory engine bay. Mated to high-flowing aluminum cylinder heads, this small-block setup delivers up to 285–295 horsepower and massive low-end torque, completely restoring your truck’s original fuel economy, hauling strength, and highway confidence.

Every engine assembly undergoes rigorous inspection, spin-testing, and compression validation to ensure flawless plug-and-play operation from the first turn of the key.

Engine Quick Facts:

• Fits: 2005-2006 Chevrolet Silverado 1500 and GMC Sierra 1500 (Also fits matching-era Tahoe, Yukon, and Suburban 1500 platforms with VIN T or Z)

• Engine Architecture: GM Gen III LS-Based Small Block V8 (LM7 / L59 Vortec 5300)

• VIN Code: VIN T or VIN Z (Must match the 8th digit of your vehicle’s VIN number)

• Factory Output: 285–295 HP / 325–335 lb-ft of Torque

• Mileage: 90,000 run-tested miles

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

A Quick Tech Note for Accuracy: While some high-end luxury trucks or performance cars of this generation utilized aluminum blocks, the standard 2005–2006 5.3L VIN T (LM7) and VIN Z (L59) engines feature an incredibly rigid cast-iron engine block paired with aluminum cylinder heads. This heavy-duty iron core is precisely why truck owners and engine builders love this platform—it offers unmatched thermal stability and handles demanding towing workloads without ever breaking a sweat.

Avoid the gamble of unpredictable junkyard core pull-outs or paying high dealership rates. Extend the working life of your truck with verified, factory-tested GM muscle. Message our team today with your zip or postal code for a fast, competitive shipping quote across the US or Australia!