L8T Factory-verified

Chevrolet · Regular Production Option

Engine, 6.6L V8, direct injection, variable valve timing, gasoline

Years 2022–27 Models 2 Factory citations 18

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Also described as Engine, 6.6L V8

Also documented for GMC

Documented applications

Express — GMT610 (2003–2027)

2022–2027 Factory-verified

the 2025–2027 guides give 401 hp at 5200 rpm and 464 lb-ft at 4000 rpm and read it Engine, 6.6L V8; the 2022–2026 upfitter lists read engine, gas, 8 cylinder, 6.6L, SIDI, VVT, cast iron; S: Cutaway 2WT (2025–2026), Cutaway 1WT CG33803, Cutaway 1WT CG33903 (2025–2026); O: Cargo 1WT, Cutaway CG33503, Passenger 1LS, Passenger 1LT

GM factory document — 2022 chevrolet 22 express savana electrical body builder sm en us 2021oct12, p.13.
GM factory document — 2023 chevrolet 23 express savana body builder sm en us 2022sep13, p.14.
GM factory document — 2024 chevrolet 24 express savana body builder manual 18553161 2023oct26, p.14.
GM factory document — 2025 chevrolet my25 express savana electrical bbm, p.12.
GM factory document — 2025 chevrolet express cargo fleet order guide, p.15.
GM factory document — 2025 chevrolet express cutaway fleet order guide, p.5.
GM factory document — 2025 chevrolet express passenger fleet order guide, p.12.
GM factory document — 2026 chevrolet my26 express savana electrical bbm, p.12.
GM factory document — 2026 chevrolet express cargo fleet order guide, p.15.
GM factory document — 2026 chevrolet express cutaway fleet order guide, p.6.
GM factory document — 2026 chevrolet express passenger fleet order guide, p.13.
GM factory document — 2027 chevrolet express cargo fleet order guide, p.15.
GM factory document — 2027 chevrolet express cutaway fleet order guide, p.3.
GM factory document — 2027 chevrolet express passenger fleet order guide, p.12.

Silverado HD (T1XX, 2020–2027)

2023, 2025–2027 Factory-verified

only in: 2500 HD, 3500 HD, 3500 HD chassis cab; 2027: 3500 HD Crew Cab model CK30943 (3500 HD engine/axle table)

GM factory document — 2023 chevrolet 23silverado 2500 3500hd electrical body builder sm en us 2022oct12, p.12.
GM factory document — 2025 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 chevrolet silverado 3500 hd retail and fleet fleet order guide, p.75.

This page aggregates every documented appearance of L8T in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.