You'll have to explain those abbreviations - don't make sense to me.
6 pts
12 pt
6
The 2012 McLaren MP4-12C has 32 valves.
The 2013 McLaren MP4-12C has 32 valves.
6qt
The 2013 Mclaren MP4-12C-Spider has 32 valves.
8b - 12c = -4
4
The 2012 McLaren MP4-12C's engine produces 592 hp @ 7000 rpm.
The 2013 McLaren MP4-12C's engine produces 616 hp @ 7500 rpm.