SIPLOWGUY Posted June 17, 2013 Share Posted June 17, 2013 What is the original AC Delco oil filter part number: PF7 or PF31? I have a 66 Cutlass with a 330-4BBL. Link to comment Share on other sites More sharing options...
rocketraider Posted June 18, 2013 Share Posted June 18, 2013 I think it's the 31. I have a Jan 65 parts book that lists the 7 for all 1959 thru 64 V8 engines and I think the 31 was used on the new design V8 blocks starting 1965.My 74 book lists the shorter PF-30 for all 59-74 V8, so there was some parts consolidation by that time. It shows only the 64-65 Busix used the PF-24, then by the 80s the even shorter 24 was listed for all 59-later B-O-P V8. Lord only knows what ACD recommends for these engines now- which is why I've started using WIX, Purolator or NAPA filters. Link to comment Share on other sites More sharing options...
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