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 - Trailering Your Tractor - by Curtis Von Fange. One of the fun things of summer and fall are the parades and tractor shows that go on across America. Many owners of tractors travel long distances to attend these shows and they usually take their restored iron along with them. Safe trailering practices and inspections will ensure that the event is a fun one. A good habit to develop when using a trailer is to give that �quick look over� before taking it on a trip. Before hooking up to it check the tongue for proper operation. The latche
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