The reference in numbers
Statistics
Classic (1960–1982)
40% Factory-verified
- ✓ Factory-verified · 1,735
- ● Confirmed · 1,819
- ◑ Single-source · 778
- ⚠ Disputed · 55
Modern (1983–2027)
96% Factory-verified
- ✓ Factory-verified · 64,605
- ● Confirmed · 920
- ◑ Single-source · 1,405
- ⚠ Disputed · 61
Of 71,378 documented option rows, 93% are confirmed against a GM factory document, and 97% are confirmed or better. Backed by 194,936 factory citations across 504 GM Heritage kits and 1087 other GM documents.
22,333Unique codes
71,378Option rows
355Model pages
194,936Factory citations
504GM Heritage kits
19Disputes resolved
Options documented by model year
Row counts per model year. Peak: 2026 with 12,728 documented options.
60
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By division
| Division | Models | Codes | Rows | Factory-verified |
|---|---|---|---|---|
| Chevrolet | 129 | 8,343 | 33,482 | 93% |
| GMC | 44 | 4,237 | 14,342 | 98% |
| Cadillac | 49 | 3,078 | 9,119 | 89% |
| Buick | 47 | 2,275 | 5,710 | 90% |
| Pontiac | 39 | 1,990 | 4,289 | 85% |
| Oldsmobile | 31 | 1,188 | 2,465 | 88% |
| Saturn | 14 | 854 | 1,519 | 99% |
| Hummer | 2 | 368 | 452 | 100% |
GMC light trucks share the Chevrolet C/K option book — see the GMC division note.
Most-optioned models
Longest-running codes
- C60 HVAC system, air conditioner, front, manual controls 1962–27
- G80 Axle, Positraction limited slip 1962–27
- J50 Power Brakes 1962–27
- A13 Window, side door, stationary, rear 1963–27
- A31 Power Windows 1963–27
- A51 Seats, front bucket 1963–27
- A64 Seat, rear 60/40 split-folding 1963–27
- A68 Seat, rear, 60/40 folding bench 1963–27
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, gas, 8 cylinder, 5.7L, sequential fuel injection, aluminum, high output LT1 Engine, 6.2L (376 ci) V8, direct injection, variable valve timing 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 Engine, gas, 6 cylinder, 3.8L, multiport fuel injection, V6, supercharged