Engine, 4.3L V6, electronic fuel injection

Years 1985–87 Models 3 Factory citations 5

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Also documented for Chevrolet GMC Oldsmobile

Documented applications

Bonneville — G-body (1982–1986)

1986 Single-source

only Amsoil's 1986 Bonneville list gives a 4.3L V6 (VIN engine code Z); Wikipedia's Bonneville article does not name it, and no Pontiac source prints the code, so it is matched by meaning; Amsoil's 1985 list has no 4.3L V6, so 1985 is not claimed; shared G-body code; cited from the Chevrolet Monte Carlo kit

GM Heritage factory kit — 1986 Chevrolet Monte Carlo, p.32.

Grand Prix — G-body (1983–1987)

1986–1987 Factory-verified

not on the 2+2; Wikipedia's infobox gives LB4, and its 1986 and 1987 sections name the fuel-injected 4.3L V6 as an option with the 3 or 4 speed automatic; Eighties Cars names LB4 for 1987; shared G-body code; cited from the Chevrolet Monte Carlo kit

GM Heritage factory kit — 1986 Chevrolet Monte Carlo, p.32.
GM Heritage factory kit — 1987 Chevrolet Monte Carlo, p.40.

Parisienne — B-body (1983–1989)

1985–1986 Factory-verified

262 cu in; Wikipedia's Chevrolet 90° V6 article names the Parisienne among the 1985 LB4 cars and lists the 1985–1986 Parisienne under its LB4 ratings; 1986 rests on the kit's air-conditioning weight remarks; shared B-body code; cited from the Chevrolet Caprice kit

GM Heritage factory kit — 1985 Chevrolet Caprice, p.18.
GM Heritage factory kit — 1986 Chevrolet Caprice, p.40.

This page aggregates every documented appearance of LB4 in the Pontiac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.