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The PF64 is the correct filter for the Z51 and non-Z51. I can verify that my Z51 came with the PF64 filter, and I've seen it on a number of other Z51 C7s.
On another C7 tech forum this same question was discussed at great length. The general consensus was that the PF48, UPF48R, PF64, and Mobil1 M1-113 were likely interchangeable on the LT1 as they were on the LS3/LS7. For me personally, I will use the Mobil1 when I change my oil the first time.
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