Buick · 1973-1982

Regal / Century

regal · century · regal sport coupe · turbo regal · grand national · century gran sport · century gs · century turbo coupe

30 option rows 26 RPO codes 13 model years

0% Factory-verified

✓ Factory-verified · 0
● Confirmed · 10
◑ Single-source · 20
⚠ Disputed · 0

Applicable options

Documented RPO codes

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Model year

Regal / Century RPO codes
Code	Option	Years	Notes & factory source	Confidence
— (Gran Sport pkg)	Century Gran Sport: appearance/handling package on Century Colonnade coupe; 350 or 455	1973–1975	Century; GS name moved from Skylark line	Confirmed
— (Stage 1)	455 Stage 1 engine option: big-valve heads, hotter cam, posi; last Stage 1 year 1974	1973–1974	Century GS; 1973: 728 built (92 four-speeds); 1974: 478 Stage 1 of 579 GS 455	Confirmed
V (VIN)	5th VIN character `V` = factory Stage 1 455 (engine codes XS '73, ZS '74)	1973–1974	Century GS Stage 1	Confirmed
M20	Muncie 4-speed manual w/ Hurst shifter	1973–1974	Century GS (92 in '73)	Confirmed
M40	Turbo Hydra-Matic 400	1973–1974	Century GS 455	Confirmed
G80	Limited-slip differential	1973–1977	Century/Regal	Confirmed
CC1	Removable roof hatch panels ("Sun Coupe" folding top used distinct pkg; 45 GS Stage 1 Sun Coupes in '73)	1973	Century	Single-source
L34 / L32	350 4-bbl / 2-bbl V8	1973–1976	Century, Regal	Single-source
F41	HD suspension (Var. 2)	1973–1977	Century/Regal	Single-source
LD7	231 V6 (odd-fire era)	1975–1976	Century, Regal	Single-source
L32 / L34 / L76	350 2-bbl / 4-bbl V8s	1975–1977	Century, Regal	Single-source
L72	455 2-bbl V8 (final big-block Colonnades)	1975–1976	Century/Estate applications	Single-source
M29 / M38 / M40	THM-200 / THM-350 / THM-400	1975–1977	Century, Regal	Single-source
BW6	Exterior decor package	1970–1976	A-body	Single-source
CB5 / CO4	Vinyl padded roof, full / rear	1970–1976	Century, Regal	Single-source
N33 / NK3	Tilt column / sport steering wheel	1975–1977	Century, Regal	Single-source
PE1 / PE2	Polycast wheels 14x7 / 15x7	1974–1977	Century, Regal	Single-source
C60 / C61	A/C manual / automatic	1973–1977	Century, Regal	Single-source
A31 / AU3	Power windows / power door locks	1973–1977	Century, Regal	Single-source
LC8	3.8L V6 turbocharged, 4-bbl Quadrajet (165 hp '78, 170 hp '79–'80) with Electronic Spark Control knock sensor — industry first	1978–1983	Regal Sport Coupe (30,508 turbo Regals in '78); 2-bbl 150 hp version offered 1978 only (its separate RPO not confirmed)	Single-source
LD5	3.8L (231) V6 2-bbl, naturally aspirated (105 hp)	1978–1982	Regal, Century (std.)	Confirmed
— (Sport Coupe decor)	Sport Coupe decor package: blackout treatment, Designers' Accent paint, turbine wheels	1979	Regal Sport Coupe	Single-source
Y47	Performance package (released mid-1981): dual-resonator exhaust, higher-stall torque converter, 3.08 rear gears; carried into 1982 (3.08 + exhaust made std.)	1981–1982	Regal Sport Coupe	Single-source
Y44	Sport Coupe Decor Package: Designers' Accent paint, blacked-out grille/wiper arms/bezels, wide rocker moldings, sport steering wheel	1982	Regal Sport Coupe	Single-source
N78	Cast aluminum wheels	1982	Regal	Single-source
WE2	Grand National package: 215 built, silver/charcoal two-tone, Lear Siegler buckets, front air dam & rear spoiler; 4.1 V6 or turbo	1982	Regal Grand National (code reused for 1984–87 GN)	Confirmed
F41	Firm ride & handling suspension	1978–1982	Regal, Century	Confirmed
G80	Limited-slip differential	1978–1982	Regal, Century	Confirmed
MX0 / M29	Automatic transmission provisions / THM-200	1978–1982	Regal, Century	Single-source
— (Century Turbo Coupe)	Century Sport/Turbo Coupe: LC8-spec 3.8 turbo in aeroback Century	1979–1980	Century	Single-source

Source document: buick/regal-century.md. Rows marked — record an option the factory offered whose RPO code is not documented in the consulted sources.