As promised, I cut the Fram filter open today.
Cardboard ends? Yes. But, solidly glued, no gaps anywhere, no degradation.
36 pleats in filter.
Rubber anti-drainback valve.(I know...filter wa just used for priming and running engine to dial it in again). Flat steel end spring that keeps the filter tight in the can.
Outer can: .0110 thickness.
Overall, nothing leaping out as horrible.
Will do a similar autopsy on my Wix/Napa filter when the time comes.
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