UK vs UK — 1966 vs 1963
| GT6 Mk III | 2500 PI | |
|---|---|---|
| Horsepower | 104 hp | 132 hp |
| Torque | 116 lb-ft | 151 lb-ft |
| Engine Size | 1,998 cc | 2,498 cc |
| 0-60 mph | 10.1 sec | 10.1 sec |
| Top Speed | 114 mph | 110 mph |
| ¼ Mile | 17.2 sec | 17.5 sec |
| Weight | 1,949 lbs | 2,811 lbs |
| Wheelbase | 2,108 mm | 2,654 mm |
| Length | 3,784 mm | 4,438 mm |
| Units Produced | 40,926 | — |
| Original MSRP | $3,100 | $4,200 |
| Value (Excellent) | $40,000 | $18,000 |
| Collectibility | 6/10 | 4/10 |
| Rarity | 6/10 | 5/10 |
It's a closely fought contest. The 1966 Triumph GT6 Mk III brings higher top speed, lighter weight, stronger collectibility to the table, and the 1963 Triumph 2500 PI answers with more power, quicker acceleration, better value. Both are excellent machines that reward their owners in different ways — there's no wrong answer here.
Triumph has long offered a diverse lineup, and comparing the 1966 Triumph GT6 Mk III with the 1963 Triumph 2500 PI highlights the breadth of the marque's engineering philosophy. The 1963 Triumph 2500 PI holds a clear advantage in raw power with 132 hp compared to 104 hp, a 28-horsepower difference that shapes the driving experience. In the sprint to 60 mph, the 1963 Triumph 2500 PI edges ahead at 10.1 seconds versus 10.1 seconds. The Triumph GT6 carries a weight advantage, tipping the scales 862 lbs lighter. On the collector market, the 1966 Triumph GT6 Mk III commands a significant premium over the 1963 Triumph 2500 PI, reflecting differences in prestige and rarity. From a collectibility standpoint, the 1966 Triumph GT6 Mk III rates higher among enthusiasts and auction houses.