UK vs UK — 1957 vs 1966
| XKSS | XJ13 Prototype | |
|---|---|---|
| Horsepower | 262 hp | 502 hp |
| Torque | 240 lb-ft | 360 lb-ft |
| Engine Size | 3,442 cc | 4,994 cc |
| 0-60 mph | 5.2 sec | 3.4 sec |
| Top Speed | 149 mph | 174 mph |
| ¼ Mile | 13.2 sec | 11.2 sec |
| Weight | 2,249 lbs | 2,000 lbs |
| Wheelbase | 2,286 mm | 2,438 mm |
| Length | 3,912 mm | 4,300 mm |
| Units Produced | 16 | 1 |
| Original MSRP | $6,900 | — |
| Value (Excellent) | $18,000,000 | — |
| Collectibility | 10/10 | 10/10 |
| Rarity | 10/10 | 10/10 |
The 1966 Jaguar XJ13 Prototype emerges ahead in most objective measures, offering more power, quicker acceleration, higher top speed. The 1957 Jaguar XKSS counters with its unique character, but the numbers favor its rival. Still, both are remarkable machines, and the final choice often comes down to which driving experience speaks to you.
Within the Jaguar stable, the 1957 Jaguar XKSS and 1966 Jaguar XJ13 Prototype represent different approaches to performance and purpose. Both carry the Jaguar badge, yet each carves out its own distinct identity. The 1966 Jaguar XJ13 Prototype holds a clear advantage in raw power with 502 hp compared to 262 hp, a 240-horsepower difference that shapes the driving experience. Under the hood, the contrast is notable: the Jaguar XKSS uses a Inline-6 DOHC (XK) displacing 3,442 cc, while the Jaguar XJ13 relies on a V12 DOHC with 4,994 cc. In the sprint to 60 mph, the 1966 Jaguar XJ13 Prototype edges ahead at 3.4 seconds versus 5.2 seconds. The Jaguar XJ13 carries a weight advantage, tipping the scales 249 lbs lighter. Rarity plays a significant role here — with only 1 units built, the 1966 Jaguar XJ13 Prototype is considerably scarcer than the Jaguar XKSS's 16 examples.