Original GM (mfg by Lester) OEM corvette 7-fin aluminum valve covers. These have the "casting flaw" which is indicated by the seam and partially cast "O" in corvette. Believed to be from an error in the molds specific to small block valve covers made late 66 and through 67. These are original new old stock, and discovered from an estate with other NOS OEM parts. No packaging and has signs of oxidization and age from sitting on shelf. Please do your own research for fitment accuracy and feel free to ask any questions.