The reference in numbers
Statistics
41% Factory-verified
- ✓ Factory-verified · 1,819
- ● Confirmed · 1,741
- ◑ Single-source · 778
- ⚠ Disputed · 49
Of 4,387 documented option rows, 41% are confirmed against a GM Heritage factory document, and 81% are confirmed or better. Backed by 2,527 factory citations across 136 distinct kits.
1,785Unique codes
4,387Option rows
26Model pages
2,527Factory citations
136GM Heritage kits
19Disputes resolved
Options documented by model year
Row counts per model year. Peak: 1970 with 1,201 documented options — the height of the muscle-car options race.
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
By division
| Division | Models | Codes | Rows | Factory-verified |
|---|---|---|---|---|
| Chevrolet | 9 | 1,036 | 2,828 | 58% |
| Cadillac | 4 | 272 | 774 | 15% |
| Pontiac | 5 | 197 | 329 | 0% |
| Oldsmobile | 4 | 155 | 267 | 23% |
| Buick | 4 | 125 | 189 | 0% |
GMC light trucks share the Chevrolet C/K option book — see the GMC division note.
Most-optioned models
Longest-running codes
- 94–99 paint codes Firemist/pearl colors standard on Eldorado, extra-cost elsewhere 1961–82
- A01 Soft Ray Tinted Glass, all windows 1962–82
- A02 Soft Ray Tinted Glass, windshield only 1962–82
- C60 Air Conditioning 1962–82
- G80 Positraction rear axle 1962–82
- J50 Power Brakes 1962–82
- N40 Power Steering 1962–82
- U63 Radio - AM push button 1962–82
Notable performance options
The codes enthusiasts chase. Each links to its full provenance.
Z28 Special Performance Package (302ci V8) L78 Engine - V8, 396 Cu. In. Special Hi. Perf. L88 427ci 430hp (nominal) competition Engine LS6 Engine - V8, 454 Cu. In. Special Hi Performance LT1 350ci 255hp (SAE net) solid-lifter Engine ZL2 Cowl-induction hood ("Special Ducted Hood Air System") L72 427ci 425hp V8, solid lifters W-30 1979: the Hurst/Olds package designation (W-30 stickers; Olds 350 R-code + TH-350, gold SSIII-style aluminum wheels, Dual Gate); 1980: 442 W-30 option, Cutlass Calais, 350 4-bbl (VIN R), LJ-code TH-350 L67 400 Ram Air IV (370 hp) — required 4-speed or auto, Safe-T-Track, 3.90 axle