3.8L V6 turbocharged, 4-bbl Quadrajet (165 hp '78, 170 hp '79–'80) with Electronic Spark Control knock sensor — industry first

Years 1978–82 Models 3

Also described as 3.8L V6 turbo 4-bbl (RPO)3.8L V6 turbocharged 4-bbl (corporate RPO as used on carbureted turbo Buicks)

Documented applications

Full-Size — LeSabre / Electra / Wildcat

1978–1979 Single-source

LeSabre Sport Coupe (attribution single-source)

Regal / Century

1978–1983 Single-source

Regal Sport Coupe (30,508 turbo Regals in '78); 2-bbl 150 hp version offered 1978 only (its separate RPO not confirmed)

Riviera

1979–1982 Single-source

Riviera S Type / T Type; RPO attribution to Riviera single-source

This page aggregates every documented appearance of LC8 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.