6
They all had flat six engines.
The Porsche 911 SC Targa, produced from 1978 to 1983, features a flat-six engine, which means it has six cylinders. This engine configuration is a hallmark of the 911 series, providing a balance of power and performance characteristic of Porsche vehicles.
6 cylinder boxer (flat) engine
The 2002 Porsche 911 has 24 valves.
The 2005 Porsche 911 has 24 valves.
The 2009 Porsche 911 has 24 valves.
The 2006 Porsche 911 has 24 valves.
The 2013 Porsche 911 has 24 valves.
The 2003 Porsche 911 has 24 valves.
The 2004 Porsche 911 has 24 valves.
The 2008 Porsche 911 has 24 valves.
The 2012 Porsche 911 has 24 valves.