I think Big fred hit it on the nose......Personally I often use a LITE coat of neversieze on spark plug threads(( usually where the plug is in a spot that is a bit-h to get to or the machine sets outside and water can pool around the plug))) and have never had a problem the engine running afterwards. This looks like a case of simply using way too much. Even then I don"t understand why the plug body didn"t ground to the block as the antisieze used looks like the type with copper in it so you"d think it would have acted as a conductor and not an isulator. To carry the thought a step further you stated the plugs were TIGHT. Typically overtightening a plug will cause internal damage to the plug that will prevent it from firing. It"s not so much the plug not grounding as it is the "circuit" gets broken internally and the plug is essentially dead wether it"s grounded or not. I"d be curious to test continuity between the electrode at the bottom of the plug and the wire connection at the top and see what the deal is there....
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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