PF-25 Oil Filters

[Kenneth T.]

Re: PF-25 Oil Filters

Ken-----


Yes, the original PF-25 had raised, embossed script on the bottom.

Hey Joe,

Any idea on how or where to find an original? There must be some out there. Thanks for sharing your knowledge.

Ken

[Joe L.]

Re: PF-25 Oil Filters

Hey Joe,

Any idea on how or where to find an original? There must be some out there. Thanks for sharing your knowledge.

Ken

Ken------


They used to show up from time-to-time on Ebay; I don't know if they still do. They usually sell for in the $400-500 range, maybe more now. They are not reproduced.

Attached are pictures of one of mine [none for sale].

[Kenneth T.]

Re: PF-25 Oil Filters

Ken------


They used to show up from time-to-time on Ebay; I don't know if they still do. They usually sell for in the $400-500 range, maybe more now. They are not reproduced.

Attached are pictures of one of mine [none for sale].

Wow Joe, you just broke my bubble. Thanks for the pictures though, it has been a very long time since I have seen one.

Ken

[Lyndon S.]

Re: PF-25 Oil Filters

Joe
On the filters with the bottom embossed were their two different wording on them? Did one also tell to replace with AC TYPE PF-25? Do you know if that was a earlier design ? And would you know the time frame of the filters in question
Kelly

[Dave S.]

Re: PF-25 Oil Filters

Lyndon,
You are right. Actually I think there may have been 3 embossed variations or the PF-25. One has a raised AC which I think is a Canadian version. The one you refer to has "REPLACE WITH AC FILTER - SEE MANUAL" embossed on the bottom and the third variation is the "BEST WAY................" version we see the most. The example I have of the second version is in a box with shows applications for 6 cyl Chevrolet, Pontiac, Oldsmobile, Studebaker and Buick and V8 Chevy II (63-68) and Chevy V8 all (64-68). It is the only one I have ever seen. I think we have to much time on our hands.

[Don G.]

Re: PF-25 Oil Filters

I also believe there were 3 versions and the suspected AC emboss(Canadian version) was probably for the replacement market only.

The REPLACE WITH AC FILTER SEE MANUAL emboss was added to the drawings on June 8, 1967 and was replaced on the drawing with BEST WAY TO PROTECT YOUR ENGINE REPLACE WITH AC on August 6,1968. The embossing was removed from the drawing on January 3, 1972.

Since it is believed that the PF-25 was not used on the Corvette until sometime during the 1969 model year, the later style embossing most likely appeared on Corvette production from mid 1969 until mid 1972.

[Kenneth H.]

Re: PF-25 Oil Filters

From the fourth edition of the NCRS 1970-1972 Tech Manual and Judging Guide (pg 98)-- "It is believed that oil filters were avaiable in 1970 through 1972 with embossing on the bottom reading BEST WAY TO PROTECT YOUR ENGINE - REPLACE WITH AC TYPE PF25. There is strong evidence that un-embossed filters were available during this time as well. However, there is no conclusive evidence what the original assembly line oil filters were for 1970 through 1972."

The fourth edition doesn't address judging points, but in the first edition of the same guide (pg 97), points are as follows: "Assign 15 points to a white AC oil filter (with or without embossing)." and "Deduct 7 points for the cuurent replacement AC filter (PF-25)"

If this still holds true, then either of the white filters will get max points.

Has anyone been on the AC Delco site lately? They list a classic PF25 filter that looks alot like the original white filter. I thought that I saw somewhere that they are selling for about $20.00, but I haven't been able to find a place to purchase them yet.

[Terry M.]

Re: PF-25 Oil Filters

From the fourth edition of the NCRS 1970-1972 Tech Manual and Judging Guide (pg 98)-- "It is believed that oil filters were avaiable in 1970 through 1972 with embossing on the bottom reading BEST WAY TO PROTECT YOUR ENGINE - REPLACE WITH AC TYPE PF25. There is strong evidence that un-embossed filters were available during this time as well. However, there is no conclusive evidence what the original assembly line oil filters were for 1970 through 1972."

The fourth edition doesn't address judging points, but in the first edition of the same guide (pg 97), points are as follows: "Assign 15 points to a white AC oil filter (with or without embossing)." and "Deduct 7 points for the cuurent replacement AC filter (PF-25)"

If this still holds true, then either of the white filters will get max points.

Has anyone been on the AC Delco site lately? They list a classic PF25 filter that looks alot like the original white filter. I thought that I saw somewhere that they are selling for about $20.00, but I haven't been able to find a place to purchase them yet.

The white PF-25 is available at your local GM parts counter. I found I had to order a case of 12. My Chevrolet dealer had to order that number and was unwilling to be stuck with the remainder or my order. A locator search turned up several dealers stocking them in the Chicago area, so if you live in a large metropolitan area you might just get lucky. A post a couple of months ago gave the GM part number for these filters.



Don't count on ALL 1970-1972 Mechanical judges being so generous as to ignore the absence of embossed filter. I doubt there is a universal ruling on this issue, and your results will depend on the judge. If you have a white filter the deduction for no emboss should only be a couple of points, so it certainly isn't worth the astronomical price the embossed filters are bringing.

[Patrick H.]

Re: PF-25 Oil Filters

I believe a filter manufacturer in Canada was licensed to build the AC PF-25 design for the aftermarket. It was white with red/blue sikscreened printing very much like the OEM filter on 1971-early74 Corvettes. However, the silkscreened printing was bilingual and the lockseam was painted white. The last I knew, they were still available in Canada. An informed judge would take a small deduction for these minor differences.

All reproductions that I have seen have minor differences from the correct OEM designs.

All this being said, the points lost between a correct original filter and a more current AC design is minimal and probably doesn't justify the premium cost for original filters. However, for some of us, the satisfaction of getting it right is priceless!

The PF-25 available in Canada 5 or so years ago looked very much like the white PF-25s used in the 70-74 era. However, as of the last year and a half or so, they do not have this same appearance.

I know that when I judged cars in Windsor at the 2004 National meet I saw many of the first variety. Last year I purchased 6 PF-25s out of Canada (brought to Carlisle by a friend) and they looked quite different. Still white, but not the same appearance as all those I saw in 2004.

Patrick

[Kenneth H.]

Re: PF-25 Oil Filters

Terry:

Thanks for the info about locating the filter. I'll try my local Chevy dealerships.

[Terry M.]

Re: PF-25 Oil Filters

Ken,

The part number is 19187300. Good luck.

[Reba W.]

Re: PF-25 Oil Filters

Because of the adoption of the NCRS matrix for judging, point values were removed from the juding guide.

With the matrix, an item is judged on configuration, completeness, date, installation, and finish, with each area receiving 20%.

[Pat M.]

Re: PF-25 Oil Filters

Don't count on ALL 1970-1972 Mechanical judges being so generous as to ignore the absence of embossed filter. I doubt there is a universal ruling on this issue, and your results will depend on the judge.

Agreed. When I read the JG as quoted above, I bought an original non-embossed filter for my 70, thinking either would be clearly acceptable. Yet while my judge at the National did not deduct for it, he said he "would expect" to see the embossed type. I took this to mean he felt he could've been justified in deducting for the non-embossed filter had he chose to.

[Lyndon S.]

Re: PF-25 Oil Filters

Were all AC Delco filters embossed during this era? Would the PF-35 have the embossing on it as well? Just curious?

Kelly

[Terry M.]