USA vs Australia — 1984 vs 1978
| Grand National GNX | Commodore VL Turbo | |
|---|---|---|
| Horsepower | 276 hp | 204 hp |
| Torque | 360 lb-ft | 251 lb-ft |
| Engine Size | 3,791 cc | 2,960 cc |
| 0-60 mph | 4.7 sec | 7.0 sec |
| Top Speed | 125 mph | 143 mph |
| ¼ Mile | 13.4 sec | 15.1 sec |
| Weight | 3,500 lbs | 2,866 lbs |
| Wheelbase | 2,743 mm | 2,668 mm |
| Length | 5,059 mm | 4,712 mm |
| Units Produced | 547 | — |
| Original MSRP | $29,290 | — |
| Value (Excellent) | $300,000 | $60,000 |
| Collectibility | 10/10 | 8/10 |
| Rarity | 9/10 | 6/10 |
Two outstanding machines, each with compelling strengths. The 1984 Buick Grand National GNX excels in more power, quicker acceleration, stronger collectibility, while the 1978 Holden Commodore VL Turbo stands out for higher top speed, lighter weight, better value. The best advice? Drive both if you can, then follow your instincts.
Putting the 1984 Buick Grand National GNX against the 1978 Holden Commodore VL Turbo is a comparison that enthusiasts have debated for decades. Each car reflects distinct design philosophies shaped by different automotive cultures — USA versus Australia. The 1984 Buick Grand National GNX holds a clear advantage in raw power with 276 hp compared to 204 hp, a 72-horsepower difference that shapes the driving experience. Under the hood, the contrast is notable: the Buick Grand National uses a V6 OHV Turbocharged (Buick 3.8L) displacing 3,791 cc, while the Holden Commodore VL relies on a Inline-6 Turbo SOHC 12V with 2,960 cc. In the sprint to 60 mph, the 1984 Buick Grand National GNX edges ahead at 4.7 seconds versus 7.0 seconds. The Holden Commodore VL carries a weight advantage, tipping the scales 634 lbs lighter. On the collector market, the 1984 Buick Grand National GNX commands a significant premium over the 1978 Holden Commodore VL Turbo, reflecting differences in prestige and rarity. From a collectibility standpoint, the 1984 Buick Grand National GNX rates higher among enthusiasts and auction houses.