RW> If your Dodge had the Hemi V8 engine, it would have a dual coil over with   
   RW> dual wires, one to a plug in the cylinder under it, the other to a plug   
   RW> in   
   RW> the opposite bank. Yes, they have two plugs per cylinder. One coil fires   
   RW> when the cylinder is near tdc, while an opposite coil will fire the 2nd   
   RW> plug when that cylinder is on an exhaust stroke. All in the name of   
   RW> emissions control. Someone told me a hundred years ago that the Chrysler   
   RW> hemispherical combustion chamber was inefficient and I guess this proves   
   RW> it.   
      
   Our Durango has a 4.7 V8, non-Hemi.   
      
   I didn't know that the Hemi engines had two spark plugs per cylinder.  I do   
   know that when you eventually change the plugs, they typically replace the   
   coils at the same time.  Can be a bit on the expensive side..   
      
   - Mark   
      
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