Engine, 5.3L V8 high output, aluminum block

Years 1963–65, 2005–07 Models 2 Factory citations 6

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Also described as 409 CID V8 340hp409ci 340 hp V8 (hydraulic cam)

Also documented for GMC

Documented applications

Impala / Full-Size

1963-65 Factory-verified

Low performance-hydraulic cam/1-4bbl

GM Heritage factory kit — 1963 Chevrolet, p.36.
1963–1965 Factory-verified

GM Heritage factory kit — 1963 Chevrolet, p.36.
GM Heritage factory kit — 1965 Chevrolet, p.59.

Silverado — GMT800 (1999–2007)

2005–2007 Factory-verified

GM factory document — 2005 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2007 chevrolet silverado classic 2wd rpo code list, p.1.
GM Heritage factory kit — 2006 Chevrolet Silverado, p.60.

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