The Mach 1 was a performance package that Ford began offering in 1969. Available with a range of engines, the potent 428 was fitted as the “Cobra Jet” and was a cheaper alternative to the BOSS 429. For drag racing a “Super Cobra Jet” was essentially the same package with a reinforced drive shaft. The 428 Super Cobra Jet upped the ante with heavy-duty internals including a stronger crankshaft and Le Mans connecting rods, plus a specific flywheel and counterweight, as well as a crankshaft harmonic balancer.
