My engine is actually stock but I'm curious anyway (besides, one day I'll have the money to severely modify it). Using a Spark plug like the Bosch Super 4 (the one with four ground electrodes) would allow to cut all four so the spark could jump to any of the four whenever otherone fails right? That could help overcome possible short period of service with this mod?

 

No. The "unused" electrodes quickly foul. It is the spark action that keeps the electrode "clean".

Going with a Zex +3 or a Bosch +4, would not really be of benefit in this type of application/modification.

As a "side note". They do have "rimfire" spark plugs for some cars. The ground electrode is a complete circle around the center postive electrode at the set spark plug gap. The problem is their gaps are significaly LARGER than ours...in the range of .080 to our .040 gap.

 

I used a dremmel on mine, took about 5minutes for all of them to make sure i got the gap right. I flattened the side of the electrod and pushed the spark gap closer to the center.