USA vs USA — 1969 vs 1967
| Cyclone Spoiler II 429 | GTX 440+6 | |
|---|---|---|
| Horsepower | 375 hp | 390 hp |
| Torque | 450 lb-ft | 490 lb-ft |
| Engine Size | 7,030 cc | 7,210 cc |
| 0-60 mph | 5.5 sec | 5.2 sec |
| Top Speed | 130 mph | 130 mph |
| ¼ Mile | 13.9 sec | 13.5 sec |
| Weight | 3,700 lbs | 3,800 lbs |
| Wheelbase | 2,972 mm | 2,946 mm |
| Length | 5,334 mm | 5,258 mm |
| Units Produced | 519 | 2,035 |
| Original MSRP | $3,759 | $3,733 |
| Value (Excellent) | $185,000 | $175,000 |
| Collectibility | 9/10 | 9/10 |
| Rarity | 9/10 | 8/10 |
This matchup is remarkably close. The 1969 Mercury Cyclone Spoiler II 429 offers greater rarity, while the 1967 Plymouth GTX 440+6 counters with quicker acceleration. Neither holds a decisive advantage, making this a true enthusiast's dilemma. Your choice ultimately depends on which driving philosophy resonates more with you.
The 1969 Mercury Cyclone Spoiler II 429 and 1967 Plymouth GTX 440+6 stand as two of the most notable Muscle Car cars from Muscle era. Both emerged during a period of intense competition, and choosing between them remains a passionate debate among collectors. On paper, the two are remarkably close in power output, with the 1969 Mercury Cyclone Spoiler II 429 producing 375 hp and the 1967 Plymouth GTX 440+6 delivering 390 hp. Under the hood, the contrast is notable: the Mercury Cyclone uses a V8 OHV (Boss 429) displacing 7,030 cc, while the Plymouth GTX relies on a V8 OHV (440 Six Pack) with 7,210 cc. In the sprint to 60 mph, the 1967 Plymouth GTX 440+6 edges ahead at 5.2 seconds versus 5.5 seconds. Rarity plays a significant role here — with only 519 units built, the 1969 Mercury Cyclone Spoiler II 429 is considerably scarcer than the Plymouth GTX's 2,035 examples. Both trade at comparable values on the collector market, making the choice between them largely one of personal preference.