Im not sure how close is "ok" but yes they will burn if they are close to the headers. You may have to "dimple" the headers inorderto make some clearance. You can also look into Accel header plugs which are a little shorter. Or you can get fiberglass boots that cover the end of the plug wire. They are a little pricey at about $8 each, but worth it in my opinion. I used a combination of dimpling the header tubes and the fiberglass boots.
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