Some people like to use plugs that are a step colder. Actually I think they use the plugs that are for the 4 cyl, just use 6 of them of course. I remember seeing some threads about klze plugs before. no time to search right now. I'm using DE plugs in my ZE and seems ok.
oh yeah, i didn't even answer the question. one thing i know is that, the klze i bought had motorcrap plugs in it and i compared it to the ngk plugs I got, which are for a klde, and the klde ones were actually longer but a millimeter or so. not sure if those motorcraft plugs were especially for the klze or not.
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