Purolator & Wix will not warranty standpipe oil filters for /6 but Baldwin will.

slantsixdan said
No, they didn't; see here.

Here y'go: 1962 TSB referring to the new standpipe with check valve replacing the previous no-valve standpipe and the no-standpipe adapter before that; '60-'63 A-body FPC showing all three parts, and the '86-'87 Dodge Truck FPC (last one to contain Slant-6 engine components) showing the standpipe with check valve.

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...and I don't know why, but I THOUGHT I remembered you saying somewhere that Chrysler removed the standpipes at some point. Obviously, I remembered incorrectly. lol