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Reply to "Twin plug"

The problem with the way a lot of machinists twin-plug heads is in the angle of the second plug in the chamber. Most guys come in on a pretty shallow angle (to clear the push-rod tubes) and end up with several exposed threads on one side of the spark-plug. This is inviting problems-- the exposed thread will carbon or degrade by their exposure to combustion, and tear the threads out of the heads the next time the plugs are removed.The wrong way

This is maybe the worst example I've seen, but there's no shortage of people with variations on this theme.

These are mine, or at least how they used to look:Mine

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