Engine, 5.0L V8, 305 cu in, 4 barrel

Years 1982–87 Models 4 Factory citations 16

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Also described as Engine, 5.0L V8, 4-barrel carburetorEngine, 5.0L V8, 4 barrel

Also documented for Chevrolet GMC

Documented applications

Bonneville — G-body (1982–1986)

1983–1986 Single-source

optional V8; Amsoil's 1983 to 1986 Bonneville lists give the 5.0L V8 (VIN engine code H), Wikipedia gives the Chevrolet 305 V8 and Curbside Classic gives the 1984 optional 5.0L V8 at 150 hp; none prints the code or says 4 barrel, so both are matched through the kit's 5.0 Liter 4 BBL V8; Wikipedia's Grand Prix article prints LE9 for the 305 on the same G-body, so the Bonneville's 1983–1985 305 may have been the 2-barrel LE9 instead; shared G-body code; cited from the Chevrolet Monte Carlo kit

GM Heritage factory kit — 1983 Chevrolet Monte Carlo, p.30.
GM Heritage factory kit — 1984 Chevrolet Monte Carlo, p.36.
GM Heritage factory kit — 1985 Chevrolet Monte Carlo, p.30.
GM Heritage factory kit — 1986 Chevrolet Monte Carlo, p.32.

Firebird — Third generation (1982–1992)

1982–1987 Factory-verified

Firebird years: Wikipedia 1982–1987; thirdgen.org powertrain tables 1982, 1984, 1986; thirdgen.org label decodes 1984; 3rdgenformula option pages 1987; shared F-body code; cited from the Camaro kits

GM Heritage factory kit — 1982 Chevrolet Camaro, p.35.
GM Heritage factory kit — 1983 Chevrolet Camaro, p.35.
GM Heritage factory kit — 1984 Chevrolet Camaro, p.3.
GM Heritage factory kit — 1985 Chevrolet Camaro, p.33.
GM Heritage factory kit — 1986 Chevrolet Camaro, p.39.
GM Heritage factory kit — 1987 Chevrolet Camaro, p.15.

Grand Prix — G-body (1983–1987)

1986–1987 Factory-verified

Eighties Cars names LG4 for 1987 and the dealer listing of a 1986 2+2 names LG4; Wikipedia names the 305 V8 in its 1986 and 1987 sections; 1987: only with the 4 speed automatic (Eighties Cars); 1983–1985 left out: those years' sources name a 305 V8 without a code, and Wikipedia's infobox, which covers the whole generation, prints LE9 for the 305, a conflict the Monte Carlo kit cannot resolve (for 1986–1987 the dated sources print LG4, which settles it); 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)

1983–1986 Single-source

305 cu in; Wikipedia's Chevrolet small-block article lists the 305 for the Parisienne and Parisienne Safari wagon through 1986 without naming the RPO code, so the code is matched to the car by meaning; shared B-body code; cited from the Chevrolet Caprice kit

GM Heritage factory kit — 1983 Chevrolet Caprice, p.13.
GM Heritage factory kit — 1984 Chevrolet Caprice, p.39.
GM Heritage factory kit — 1985 Chevrolet Caprice, p.41.
GM Heritage factory kit — 1986 Chevrolet Caprice, p.41.

This page aggregates every documented appearance of LG4 in the Pontiac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.