Buick Special / Skylark / Gran Sport / GSX / Apollo (1961–1982)

Covers the compact Special/Skylark (1961–63), A-body Special/Skylark (1964–72), Gran Sport / GS 340 / GS 350 / GS 400 / GS 455 / GSX (1965–72), the X-body Apollo (1973–75) and Skylark (1975–79), and the FWD X-body Skylark (1980–82). The 1973–74 Century Gran Sport / Stage 1 continuation is documented in regal-century.md.

Code systems: through 1972, Buick order forms used short letter+digit dealer ordering codes (A1, H6, I-6, …); build sheets used corporate RPO codes (M21, G80, B97, …). See the division README for the distinction.

Years 1961–1964 {#year-1961}

Special (compact, 1961–63; A-body from 1964) and Skylark (introduced mid-1961 as a Special sport trim). No machine-readable factory option code sheets for these years were located — coverage gap. Notable narrative facts: aluminum 215 V8 optional 1961–63; Skylark became its own series for 1962.

Year 1965 {#year-1965}

Years 1966–1967 {#year-1966}

Years 1968–1969 {#year-1968}

Notes: no third-party (Sloan Museum) documentation exists for 1969; authentication relies on paperwork or drivetrain stampings (stage1registry.com). 1969 Stage 1 documentation codes: head casting 1231109, carb 7029246, distributor 1111962, axle codes OO 3.42 (A/C) / ON 3.64 (no A/C).

Year 1970 {#year-1970}

From the factory 1970 intermediate option sheet (TeamBuick transcription) — dealer ordering codes:

Ram air: the 1970 GS 455 used functional dual hood scoops feeding a dual-snorkel air cleaner (standard); Stage 1 (A1) retained it with the hotter engine (confirmed).

Years 1971–1972 {#year-1971}

1971 caution (stage1registry): GM's 68-day strike disrupted 1971 paperwork; Protect-O-Plate stamping errors are common, and no third-party documentation exists for 1971.

Years 1973–1975 — Apollo {#year-1973}

Apollo (X-body, Nova-derived) replaced the Skylark name 1973–75. Options were corporate RPO codes shared across the X-body; Buick-specific transcriptions were not located online — coverage gap. Applicable RPO examples from the 1970–76 Buick option list: L22 (250 six), L32/L34 (350 2-bbl/4-bbl V8), M15/M20/M38/M40 (transmissions), G80 (posi), F41 (HD suspension), N33 (tilt), C60 (A/C) — all single-source for Apollo application.

Years 1975–1979 — Skylark (X-body) {#year-1975}

Skylark name returned mid-1975 on the X-body (Skylark S/R top trim). RPO-era codes; year-specific Buick tables not located — coverage gap. Common RPOs per the 1970–76 list and TriShield trunk-label list: LD7/LD5 (231 V6), LG3 (305 2-bbl), LM1 (350 4-bbl), M29 (THM-200), G80, F41, N33, B93 (door edge guards), A31 (power windows), AU3 (power locks). Confidence: single-source.

Years 1980–1982 — Skylark (FWD X-body) {#year-1980}

FWD X-car Skylark (Limited, Sport Coupe/Sedan). No Buick-specific option code table located online — coverage gap; codes follow corporate RPO practice (e.g. LE2 2.8 V6 usage is unverified for Buick — omitted).

Stage 2 (reference)

Dealer-available race package, 1969–70 (parts continued over the counter): 1969 — cam, high-compression forged pistons, Kustom headers, intake/carb, gears (no special heads); 1970 — D-port Stage 2 heads, matching Kustom headers, radical cam, forged pistons, Edelbrock B4B aluminum intake, Holley carburetor. Estimated near 500 hp; if ordered with the car, parts were shipped in the trunk. Never a regular production option — no RPO/ordering code documented. Confidence: confirmed (existence/contents), no code.

Sources

• TeamBuick — 1970 Options, Intermediate Size Buicks: https://www.teambuick.com/reference/dealer_code_70_intermediate.php
• TeamBuick — 1970–1976 Buick Option Codes (RPO): https://teambuick.com/reference/ident_option-codes_70-76.php
• Factory Stage 1 Registry: http://www.stage1registry.com/stage1info.html
• GSX Home Page — 1970 GSX production info: http://www.buickgsx.com/1970gsxinfo.htm
• Horsepower Memories — 1970 Buick GSX: https://horsepowermemories.com/2018/07/03/1970-buick-gsx/
• autoevolution — 1969 GS 400 Stage 1 (A1 code): https://www.autoevolution.com/news/rare-original-one-owner-1969-buick-gs-400-stage-1-is-all-wrong-year-engine-and-price-247963.html
• HowStuffWorks — 1964–65 Skylark & Gran Sport; 1965–1967 Gran Sport: https://auto.howstuffworks.com/1964-1965-buick-skylark-gran-sport.htm, https://auto.howstuffworks.com/1965-1967-buick-gran-sport.htm
• Hagerty — 1970 GS Stage 2 / 1973 GS Stage 1 articles: https://www.hagerty.com/media/archived/1970-gs-stage-2-baddest-buick-ever/
• DrivingLine — Buick 455 history: https://www.drivingline.com/articles/a-history-of-the-buick-455-v8-gms-overlooked-big-block-v8/
• TriShield — option/trunk-label codes: http://www.trishield.com/Directory/optioncodes.shtml
• Wikipedia — Buick Gran Sport (cross-check): https://en.wikipedia.org/wiki/Buick_Gran_Sport