Identifying Correct PF 29 and A212CW

[Grant W.]

Re: Identifying Correct PF 29 and A212CW

Hi Dale
I don't know what they are. I think some sort of date coding??? I will ask the person who had repro's made and give you a follow up or maybe Joe may know???
Thanks, Grant

[Joe L.]

Re: Identifying Correct PF 29 and A212CW

Hi Dale
I don't know what they are. I think some sort of date coding??? I will ask the person who had repro's made and give you a follow up or maybe Joe may know???
Thanks, Grant

Grant and Dale------


I do not know, but I'd say it's either a date code or a manufacturing code of some sort or, perhaps, both. Don Griffin might know since he worked for many years at AC Division.

[Peter L.]

Re: Identifying Correct PF 29 and A212CW

Don - There were 2 versions of the AC A212CW that I and others are aware of that were used in the early 70s. Specifically in 70 and 71 and perhaps 69 and 73 there was a version with the expanded metal outer support that had a diamond pattern but the metal was much heavier that the material used on the later versions of the A212CW. The other version used the vertical/horizontal "chicken" wire as the outer support. Pete

[Ronald L.]

Re: Identifying Correct PF 29 and A212CW

Mark,
Where is the embossing on the 69 PF 25 canister?

[Mark D.]

Re: Identifying Correct PF 29 and A212CW

Ron,

Due to some excellent research by our very own, Joe Lucia, it is now accepted that the PF29 was used up to a point in early model year 1969. After that it is, generally, accepted that Corvettes used PF25 as the assembly line oil filter and it was embossed on the bottom.

Now for the world according to Mark...at some point around the last of the 1969 build or, at the end of the 69 build or, sometime early in the 1970 model year build, I believe the PF 25 soldiered on but without embossing on the bottom.

That's about it...

[Ronald L.]

Re: Identifying Correct PF 29 and A212CW

Mark, thanks.

This filter you have posted says BEST WAY TO PROTECT YOUR ENGINE REPLACE WITH AC.

Have you or anyone seen this variation (pic below), that says 'only' ALWAYS REPLACE WITH AC???

[Dave S.]

Re: Identifying Correct PF 29 and A212CW

Mark, thanks.

This filter you have posted says BEST WAY TO PROTECT YOUR ENGINE REPLACE WITH AC.

Have you or anyone seen this variation (pic below), that says 'only' ALWAYS REPLACE WITH AC???

That style filter was never used on a Corvette application. Over the years it has been speculated that style is a filter either made in or used in Canada. Another version of the PF-25 has the wording "upside down" from the USA filters.

[Ronald L.]

Re: Identifying Correct PF 29 and A212CW

I would agree from my small sample size data with this statement that this was either made in and or used in Canada and NOT the U.S.A.

[Don G.]

Re: Identifying Correct PF 29 and A212CW

According to engineering drawings of PF-25 filters, the message "REPLACE WITH AC FILTER SEE MANUAL" was released in June, 1967. The message was changed to " BEST WAY TO PROTECT YOUR ENGINE REPLACE WITH AC" in August, 1968. Embossing was removed from the drawings in January, 1972. There are no records to indicate precisely when these changes were implemented on the assembly line since no part number changes were involved. There is speculation that the removal of the embossed message was motivated by draw die maintenance cost. The earlier version of the message was not likely to have been original equipment on Corvettes based on these dates.

[Ronald L.]

Re: Identifying Correct PF 29 and A212CW

Oil filters were put on at the Engine plant, why would the filter be any different from any other engine taking this application? Perhaps it is just that these filters I inquired about have only appeared in Canada, and the US parts were 'used up'?

[Dave S.]

Re: Identifying Correct PF 29 and A212CW

Oil filters were put on at the Engine plant, why would the filter be any different from any other engine taking this application? Perhaps it is just that these filters I inquired about have only appeared in Canada, and the US parts were 'used up'?

They were likely service filters. Its easy to check the timeframe if you have the box as the boxes are dated.

[John H.]

Re: Identifying Correct PF 29 and A212CW

Oil filters were put on at the Engine plant, why would the filter be any different from any other engine taking this application?

Ron -

Oil filters were installed on the engine dress line at St. Louis, not at the engine plants.

[Dick W.]

Re: Identifying Correct PF 29 and A212CW

I would not expect to see embossing on a PF29. I would on a 1969 PF25.

Mark

Agreed. Paul Oslansky has done a lot of research on these filters. Maybe he will chime in with his observations.

[Don G.]

Re: Identifying Correct PF 29 and A212CW

John is correct. The oil filters were installed on the Corvette engine dress line in the St. Louis assembly plant. However, beginning with the 1985 model using the tuned port injection engine, oil filters were installed in the engine plant and the engine was shipped to the Bowling Green assembly plant with the oil filter installed. This practice continued with LT-1 engines utilizing PF-51 and then PF-52 oil filters through the 1996 model. All original equipment oil filters used on C-4 models were painted black with black and silver labels while service replacement oil filters continued to be blue with red, white and blue labels as required by AC-Delco Marketing.

[Ronald L.]

Re: Identifying Correct PF 29 and A212CW

While we started with the PF 29, the PF 25 followed this , has anyone seen a black filter as the original installed filter, opinions???