AC Delco oil filter bypass pressure

[TexHawk]

Does anyone know where specs are for the bypass valve opening pressures for various oil filters? Especially, AC Delco PF64? I have seen some information that the PF64 bypass pressure has been increased to 22 PSI, while the WIX equivalent (57060) still has a bypass pressure of 12 PSI. The increase in pressure is supposed to be because GM engines now have a variable volume oil pump and the higher pressure is to keep more unfiltered oil from being dumped in the engine...

 

[Linctex]

I HONESTLY do not think it matters: https://bobistheoilguy.com/forums/ubbthreads.php/topics/3197094/

 

[ZeeOSix]

Maybe AC Delco filters are pretty restrictive so they bumped up the bypass setting for that application. The less flow restrictive a filter is, the lower the bypass valve setting can be.