Paul, I must have misunderstood the idea of the trailing hole mod. In the earlier versions of the engine, (read I go back to the distributor era) the split timing was always used. In must of the electronic ignition cars I have worked on the split timing was used by the factory. Is the intent to use two separate ingition modules and coils firing at the same time just to have redundancy? I didn't meant to set off a firestorm here but we will lose power by not firing the trailing plug retarded. If firing both plug at the same time is the intent I can at least understand it. Both plugs would need to be totally independent of course. Dual coils dual ignition modules etc.

 In a related info item several of the ignition systems I have seen use the dual lead coils. I am not sure what Tracy is using. If the dual lead coils are used to fire two plugs it isn't dual ignition, since the dual lead coils are 1 coil with a floating secondary, ie 1 secondary winding. If the coil fails both plugs go dead. In the motorcycle business the 2 lead coils are used all over on 4 cylinders wasting a spark in the ex stroke. I only mention this since we found there were some interesting spark plug failures since one plug fires backward. On the 2 lead coils Kawasaki recomended NOT using fine wire electrode plugs (platinum or whatever) singe the reverse spark would mess up the center electrode on the one firing backward. Just an FYI. Hope I wasn't too redundant myself. Bill Jepson

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