Engine, 5.7L V8, 4 barrel, heavy duty

Years 1983–86 Models 3 Factory citations 11

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Also documented for Chevrolet

Documented applications

Sierra — Square body (1983–1991)

1983–1986 Factory-verified

shared platform code; cited from the square-body C/K pickup kits; the option pages offer this 5.7 liter (350 cu in) 4 barrel V8 with the heavy duty chassis (C6P), the 20 series bonus and crew cab and 30 series

GM Heritage factory kit — 1983 Chevrolet Truck, p.15.
GM Heritage factory kit — 1984 Chevrolet Truck, p.25.
GM Heritage factory kit — 1985 Chevrolet Truck, p.25.
GM Heritage factory kit — 1986 Chevrolet Truck, p.22.

Suburban — Square body (1983–1991)

1983–1986 Factory-verified

only in: 20/2500 series; 1984 and 1985 from the power team charts, which head the C20906 and K20906 teams with LT9; shared square-body platform code; cited from the Chevrolet Suburban kit

GM Heritage factory kit — 1983 Chevrolet Suburban, p.13.
GM Heritage factory kit — 1984 Chevrolet Suburban, p.10.
GM Heritage factory kit — 1985 Chevrolet Suburban, p.10.
GM Heritage factory kit — 1986 Chevrolet Suburban, p.15.

Vandura and Rally — Second generation G-series (1983–1996)

1983, 1984, 1986 Factory-verified

350 cu in; G30 with C6P heavy duty chassis; shared G-van platform code; cited from the Chevrolet G-Van kit

GM Heritage factory kit — 1983 Chevrolet Vandura, p.7.
GM Heritage factory kit — 1984 Chevrolet G Van, p.14.
GM Heritage factory kit — 1986 Chevrolet G Van, p.21.

This page aggregates every documented appearance of LT9 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.