The 425’s stroke was lengthened to 4.25 in (108 mm) to achieve a 455 cu in (7.5 L) to create the Rocket 455 for 1968. It kept the retired 425’s 4.126 in bore to produce between 275 and 400 hp. Initially the paint was red, except for metallic blue in the Toronado applications; 1970-1976 versions were metallic blue at first, then nonmetallic blue.


The “Rocket” name disappeared from the air cleaner identification decal after 1974. Although production of the 455 ended in 1976, a small number were produced through 1978 for power equipment use, such as motorhomes, boats and irrigation equipment.

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