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 - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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