The Comet Cyclone was offered from 1964 - 1972. It's first intro hit the market in 1964 with a 289 V8 rated at 210 hp. Mercury dealers also offered a line of "Cobra" high performance equipment available for the 289 V-8 engine. A special 271 hp version of the 289 V-8 was offered, a Cobra heavy-duty clutch, special carburetors, air cleaners, valve covers and many other performance related items were offered under this special Cobra line.
In 1966 Mercury went full blast and offered a Cyclone GT powered by a 335hp 390 V8 and in 1967 Mercury offered a 427 with 425 hp.