I was examining my grill teeth assembly on my 60 corvette. The assembly has what appears to be original chrome. The teeth are very variable in point sharpness. Some are sharp ( center tooth the sharpest.) But many are blunted or not nearly as sharp as the center tooth. I was looking at a 60 corvette at Carlisle today and found the same variation in grill teeth sharpness. The tech manual states all sharp and replacement teeth as dull. Is this correct? Thanks for help.