USA vs USA — 1964 vs 1973
| GTO 389 Tri-Power | Grand Am 455 V8 | |
|---|---|---|
| Horsepower | 348 hp | 250 hp |
| Torque | 428 lb-ft | 390 lb-ft |
| Engine Size | 6,375 cc | 7,456 cc |
| 0-60 mph | 6.6 sec | 8.0 sec |
| Top Speed | 125 mph | 118 mph |
| ¼ Mile | 14.8 sec | 15.8 sec |
| Weight | 3,400 lbs | 4,100 lbs |
| Wheelbase | 2,921 mm | 2,845 mm |
| Length | 5,181 mm | 5,334 mm |
| Units Produced | 32,450 | 56,063 |
| Original MSRP | $2,852 | $4,353 |
| Value (Excellent) | $120,000 | $32,000 |
| Collectibility | 9/10 | 6/10 |
| Rarity | 5/10 | 5/10 |
The 1964 Pontiac GTO 389 Tri-Power holds an edge across most measurable criteria, offering more power, quicker acceleration, higher top speed. That said, the 1973 Pontiac Grand Am 455 V8 brings better value and remains a compelling choice for enthusiasts who value Pontiac heritage. The right pick depends on whether you prioritize specifications or the intangible qualities that make a car truly special.
The 1964 Pontiac GTO 389 Tri-Power and 1973 Pontiac Grand Am 455 V8 share a manufacturer in Pontiac, but that's where the similarities get interesting. These two models reveal the versatility and ambition of the Pontiac brand. The 1964 Pontiac GTO 389 Tri-Power holds a clear advantage in raw power with 348 hp compared to 250 hp, a 98-horsepower difference that shapes the driving experience. Under the hood, the contrast is notable: the Pontiac GTO uses a V8 OHV (Pontiac 389) displacing 6,375 cc, while the Pontiac Grand Am relies on a V8 OHV (Pontiac 455) with 7,456 cc. In the sprint to 60 mph, the 1964 Pontiac GTO 389 Tri-Power edges ahead at 6.6 seconds versus 8.0 seconds. The Pontiac GTO carries a weight advantage, tipping the scales 700 lbs lighter. On the collector market, the 1964 Pontiac GTO 389 Tri-Power commands a significant premium over the 1973 Pontiac Grand Am 455 V8, reflecting differences in prestige and rarity. From a collectibility standpoint, the 1964 Pontiac GTO 389 Tri-Power rates higher among enthusiasts and auction houses.