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Old 05-31-2022, 07:53 AM   #53
Vtor_ZL1
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The PF48/PF48E has a pressure specification of 15 PSI (100 kPa)

PF64/PF63E [GM 12690385] has a pressure specification of 22 PSI (150 kPa).

https://gm-techlink.com/?p=7627 - would seem to indicate that PF63E is 22psi variety.
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