USA vs USA — 1969 vs 1967
| Mustang Boss 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 | 6.8 sec | 5.2 sec |
| Top Speed | 122 mph | 130 mph |
| ¼ Mile | 14.1 sec | 13.5 sec |
| Weight | 3,540 lbs | 3,800 lbs |
| Wheelbase | 2,743 mm | 2,946 mm |
| Length | 4,775 mm | 5,258 mm |
| Units Produced | 1,358 | 2,035 |
| Original MSRP | $4,798 | $3,733 |
| Value (Excellent) | $600,000 | $175,000 |
| Collectibility | 10/10 | 9/10 |
| Rarity | 10/10 | 8/10 |
This matchup is remarkably close. The 1969 Ford Mustang Boss 429 offers lighter weight, stronger collectibility, while the 1967 Plymouth GTX 440+6 counters with quicker acceleration, higher top speed, better value. 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 Ford Mustang Boss 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 Ford Mustang Boss 429 producing 375 hp and the 1967 Plymouth GTX 440+6 delivering 390 hp. Under the hood, the contrast is notable: the Ford Mustang uses a V8 OHV (semi-hemispherical combustion chambers) 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 6.8 seconds. The Ford Mustang carries a weight advantage, tipping the scales 260 lbs lighter. On the collector market, the 1969 Ford Mustang Boss 429 commands a significant premium over the 1967 Plymouth GTX 440+6, reflecting differences in prestige and rarity.