UK vs UK — 1948 vs 1968
| XK120 | XJ6 Series I 4.2 | |
|---|---|---|
| Horsepower | 180 hp | 245 hp |
| Torque | 195 lb-ft | 283 lb-ft |
| Engine Size | 3,442 cc | 4,235 cc |
| 0-60 mph | 10.0 sec | 8.8 sec |
| Top Speed | 120 mph | 122 mph |
| ¼ Mile | 17.5 sec | 16.5 sec |
| Weight | — | 3,722 lbs |
| Wheelbase | 2,591 mm | 2,762 mm |
| Length | 4,420 mm | 4,972 mm |
| Units Produced | 12,055 | 82,127 |
| Original MSRP | — | $6,560 |
| Value (Excellent) | $250,000 | $75,000 |
| Collectibility | 5/10 | 7/10 |
| Rarity | 5/10 | 5/10 |
The 1968 Jaguar XJ6 Series I 4.2 emerges ahead in most objective measures, offering more power, quicker acceleration, higher top speed. The 1948 Jaguar XK120 counters with greater rarity, 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 1948 Jaguar XK120 and 1968 Jaguar XJ6 Series I 4.2 represent different approaches to performance and purpose. Both carry the Jaguar badge, yet each carves out its own distinct identity. The 1968 Jaguar XJ6 Series I 4.2 holds a clear advantage in raw power with 245 hp compared to 180 hp, a 65-horsepower difference that shapes the driving experience. Under the hood, the contrast is notable: the Jaguar XK120 uses a Inline-6 DOHC 12V displacing 3,442 cc, while the Jaguar XJ6 relies on a Inline-6 DOHC with 4,235 cc. In the sprint to 60 mph, the 1968 Jaguar XJ6 Series I 4.2 edges ahead at 8.8 seconds versus 10.0 seconds. Rarity plays a significant role here — with only 12,055 units built, the 1948 Jaguar XK120 is considerably scarcer than the Jaguar XJ6's 82,127 examples. On the collector market, the 1948 Jaguar XK120 commands a significant premium over the 1968 Jaguar XJ6 Series I 4.2, reflecting differences in prestige and rarity. From a collectibility standpoint, the 1968 Jaguar XJ6 Series I 4.2 rates higher among enthusiasts and auction houses.