L33 ✓ Factory-verified

GMC · Regular Production Option

Engine, 5.3L V8 high output, aluminum block

Years 2005–07 Models 1 Factory citations 2

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Also documented for Chevrolet

Documented applications

Sierra — GMT800 (1999–2007) →

• 2005–2007 ✓ Factory-verified
  ⛭ GM factory document — 2005 gmc gmc c sierra 2wd rpo code list, p.1.

  ⛭ GM factory document — 2007 gmc sierra classic 2wd rpo code list, p.1.

This page aggregates every documented appearance of L33 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.