The Twin-Six will fire all 12 cylinders just like any other 4 stroke engine,
Firing Order: 1-4-9-8-5-2-11-10-3-6-7-12 This order is cast into the intake manifold of the V12, not the block.
A side note, these engines will run on just one bank of cylinders, I have been told by a few guys that found their V12 running raty and it was because of bad points of coil on one side or the other.
Rating of hourse & torque can be found here:
GMC V6 & V12 Engine Data MPG were vary low, mite have be GPM, but back in the 60 gas was what? $.25 a gallon...
