I believe that the plugs you recieved from the parts store the first time were to big for the hole...right? If the plug was to big I have had the same problem, I raised hell at the partshouse for selling me the wrong plugs, but them we cross referenced the part number on the old plugs. I had heads off of an '86 capri, mid '80's crown vic, or a 4 cylinder stang. I recently took my heads off to replace head gaskets and found that the head was the closed chamber design.....thats a plus!!!
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