Hey im new here and hopeing to get a little help and give some if i can. I have a 03 altima 3.5 SE and It started to make a noise. So i took it in and they said it had something to do with the cam gear and wieghts for the valve timming. Have any of you ever heard of this? I have a shop but i dont work on anything but pre 73 vehicles. Any help would be greatly appreciated. Thanks.....