Buick Nailhead Valve Covers. I just had a set of aluminum valve covers glass beaded today. They are for a Buick Nailhead 401/425. They came off of a 66 Riv. I am listing these on the board here first before they go to ebay. The last two pair on ebay went for $355 & $313, these are much nicer than the ones posted on ebay. I am asking for $325, you pay actual shipping cost.