This is hard to answer without the engine size. There are magnums, 340, 383, 440.
The 2014 Dodge Challenger has 24 valves.
The 2010 Dodge Challenger has 24 valves.
The 2009 Dodge Challenger has 24 valves.
The 2012 Dodge Challenger has 24 valves.
The 2011 Dodge Challenger has 24 valves.
The 2013 Dodge Challenger has 24 valves.
The 2008 Dodge Challenger has 16 valves.
368
197.7"
The 2011 Dodge Challenger's engine produces 305 hp @ 6350 rpm.
The 2008 Dodge Challenger's engine produces 425 hp @ 6200 rpm.
The 2010 Dodge Challenger's engine produces 250 hp @ 6400 rpm.