Engine, 2.8L (173 cu in) V6, multiport fuel injection

Years 1985–89 Models 2 Factory citations 4

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Also described as 2.8 L (173 cu in) V6, multi-port fuel injection

Also documented for Buick Cadillac Chevrolet Oldsmobile

Documented applications

6000 — A-body (1982–1991)

1985–1989 Factory-verified

the Celebrity kits call it the high-output V6 in 1985, 1986 and 1988; the 1987 kit page prints the code as [B6, so 1987 rests on Wikipedia's 6000 table; 6000 years: Wikipedia's 60° V6 article 1985–1989 (its 6000 article's engine table gives 1987–1989); shared A-body code; cited from the Chevrolet Celebrity kits

GM Heritage factory kit — 1985 Chevrolet Celebrity, p.43.
GM Heritage factory kit — 1986 Chevrolet Celebrity, p.42.
GM Heritage factory kit — 1988 Chevrolet Celebrity, p.46.
GM Heritage factory kit — 1989 Chevrolet Celebrity, p.10.

Grand Prix — W-body (1988–1996)

1988–1989 Single-source

the 1988 engine, 130 hp; replaced by the 3.1L V6 midway through 1989, when the 2.8L stayed with the manual and automatic transmissions (Wikipedia); Wikipedia's 60° V6 article lists the Grand Prix under LB6 for 1988–1989, and its Grand Prix article names an MPFI 2.8 L V6 without printing the code; no listed Lumina or Monte Carlo kit page prints it

This page aggregates every documented appearance of LB6 in the Pontiac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.