Olds dropped the 66 before the introduction of its "Rocket" engines, leaving only the 88 and the 98. In the 1950s the nomenclature changed again, and trim levels also received names that were then mated with the model numbers. This resulted in the Oldsmobile 88 emerging as base Dynamic 88 the better trimmed Delta 88, and the highline Super 88. Other fullsize model names included the "Holiday" used on hardtops, and "Fiesta" used on its station wagons. The Oldsmobile 1949 Rocket engine was made notable as the first mass-produced OHV V8.