Porsche 911 (993) Engine Codes The introduction of the model 993 marked the last of the model 911 versions powered by the air-cooled Porsche flat-six M64 engine. Every 993 produced was equipped with a derivative of the M64 engine, beginning with the standard 3.6L which pumped out 272 HP and carried the series through 1996 when the 285 HP VarioRam – equipped engine was utilized. There was also a more powerful 3.8L version available as standard in the Carrera RS … Continue reading Porsche 911 (993) Engine Numbers (All Years)