UK vs UK — 1966 vs 1975
| GT6 Mk III | TR7 Drophead | |
|---|---|---|
| Horsepower | 104 hp | 92 hp |
| Torque | 116 lb-ft | 112 lb-ft |
| Engine Size | 1,998 cc | 1,998 cc |
| 0-60 mph | 10.1 sec | 9.1 sec |
| Top Speed | 114 mph | 109 mph |
| ¼ Mile | 17.2 sec | 17.0 sec |
| Weight | 1,949 lbs | 2,238 lbs |
| Wheelbase | 2,108 mm | 2,159 mm |
| Length | 3,784 mm | 4,064 mm |
| Units Produced | 40,926 | 112,368 |
| Original MSRP | $3,100 | $7,000 |
| Value (Excellent) | $40,000 | $25,000 |
| Collectibility | 6/10 | 4/10 |
| Rarity | 6/10 | 3/10 |
The 1966 Triumph GT6 Mk III holds an edge across most measurable criteria, offering more power, higher top speed, lighter weight. That said, the 1975 Triumph TR7 Drophead brings quicker acceleration, better value and remains a compelling choice for enthusiasts who value Triumph heritage. The right pick depends on whether you prioritize specifications or the intangible qualities that make a car truly special.
The 1966 Triumph GT6 Mk III and 1975 Triumph TR7 Drophead share a manufacturer in Triumph, but that's where the similarities get interesting. These two models reveal the versatility and ambition of the Triumph brand. On paper, the two are remarkably close in power output, with the 1966 Triumph GT6 Mk III producing 104 hp and the 1975 Triumph TR7 Drophead delivering 92 hp. Under the hood, the contrast is notable: the Triumph GT6 uses a Inline-6 OHV displacing 1,998 cc, while the Triumph TR7 relies on a Inline-4 OHC with 1,998 cc. In the sprint to 60 mph, the 1975 Triumph TR7 Drophead edges ahead at 9.1 seconds versus 10.1 seconds. The Triumph GT6 carries a weight advantage, tipping the scales 289 lbs lighter. From a collectibility standpoint, the 1966 Triumph GT6 Mk III rates higher among enthusiasts and auction houses.