Engine, 4.3L V6, 4 barrel

Years 1985–86 Models 2 Factory citations 4

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Also documented for Chevrolet

Documented applications

Sierra — Square body (1983–1991)

1985, 1986 Factory-verified

shared platform code; cited from the square-body C/K pickup kits; the 1986 option page lists the 4.3 liter (262 cu in) 4 barrel V6

GM Heritage factory kit — 1985 Chevrolet Truck, p.23.
GM Heritage factory kit — 1986 Chevrolet Truck, p.20.

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

1986 Factory-verified

262 cu in; Rally passenger van (p.21): G10 and G20 only; Vandura cargo van (p.59): standard on G10–G30; shared G-van platform code; cited from the Chevrolet G-Van kit

GM Heritage factory kit — 1986 Chevrolet G Van, p.21.
GM Heritage factory kit — 1986 Chevrolet G Van, p.59.

This page aggregates every documented appearance of LB1 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.