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Factory installed PF46 oil filter

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  • Harry S.
    Extremely Frequent Poster
    • July 31, 2002
    • 5295

    #16
    Re: Factory installed PF46 oil filter

    Actually I think it's about 5 filters.

    Just got off the phone with Chevy parts. For a 2006 with a base engine and Z51, the most current part is a PF46E 12737094. The prior number is 12731172.

    Amazing


    Comment

    • Patrick H.
      Beyond Control Poster
      • December 1, 1989
      • 11643

      #17
      Re: Factory installed PF46 oil filter

      Any idea how the length of a PF63 compares to an original PF 46 or 48?

      The PF46E is shorter than the factory-installed PF46. I know that the 63 is longer than the 48E but have not compared the size to an original 46.
      Vice-Chairman (West), Michigan Chapter NCRS
      71 "deer modified" coupe
      72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
      2008 coupe
      Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.

      Comment

      • Harry S.
        Extremely Frequent Poster
        • July 31, 2002
        • 5295

        #18
        Re: Factory installed PF46 oil filter

        Originally posted by Patrick Hulst (16386)
        Any idea how the length of a PF63 compares to an original PF 46 or 48?

        The PF46E is shorter than the factory-installed PF46. I know that the 63 is longer than the 48E but have not compared the size to an original 46.
        Patrick, just got off the phone with Rich. He will post details later. A quick one, PF46's and PF48's are not interchangeable. The thread diameter is different and the PF46 ( for 2005 and 2006 ) will not mount on a 2007 or newer. There is a baffle in PF46, none that Frank can see in the PF48.

        I was also on the phone with Frank Tetro, sorry about the typo.
        Last edited by Harry S.; March 22, 2024, 11:20 AM.


        Comment

        • Donald S.
          Very Frequent User
          • August 31, 1996
          • 186

          #19
          Re: Factory installed PF46 oil filter

          Adding to the discussion......

          IMG_1409.jpgIMG_1410.jpg

          Don

          Comment

          • Patrick H.
            Beyond Control Poster
            • December 1, 1989
            • 11643

            #20
            Re: Factory installed PF46 oil filter

            Originally posted by Harry Sadlock (38513)
            Patrick, just got off the phone with Frank. He will post details later. A quick one, PF46's and PF48's are not interchangeable. The thread diameter is different and the PF46 ( for 2005 and 2006 ) will not mount on a 2007 or newer. There is a baffle in PF46, none that Frank can see in the PF48.
            Thanks Harry.
            One would then assume that the adapter on the block for an LS6 (Z06) for 2005 and later matches an LS3, as my 2008 LS3 came with a PF48.

            I have a PF44 and PF48 at home.
            I just ordered a PF63 so that I can compare it, and see if the length - and now thread - is similar. I'll use it on my truck.
            Vice-Chairman (West), Michigan Chapter NCRS
            71 "deer modified" coupe
            72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
            2008 coupe
            Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.

            Comment

            • Richard M.
              Super Moderator
              • August 31, 1988
              • 11323

              #21
              Re: Factory installed PF46 oil filter

              Interesting.

              When I told Harry my Ebay find NOS PF 46(88984215), wouldn't thread on my '07 LS2, we both were confused.

              Here are the 2 side by side to show the height difference of the PF48/PF46.

              PF48 is 3.125" H
              PF46 is 3.345" H
              (both with gaskets removed)
              20240322_091838.jpg

              The thread diameter is larger on the PF 48, as can be seen visually below.
              20240322_092047.jpg

              PF48 is ~0.810" thread diameter. I don't know the pitch.
              20240322_133045.jpg

              PF46 is ~0.750" thread diameter. I don't know the pitch.
              20240322_132910.jpg

              Then I recalled this morning that I read somewhere on the parts site about the filter bypass valve missing on the PF48, so it may be that the '05/'06 does not have a bypass valve in the block, and requires the PF46 with the integrated bypass valve built into the top of the filter.

              PF48 closeup showing the bypass valve.
              20240322_132957.jpg

              PF 48 stencils showing (what may be) cross reference part numbers.
              20240322_132608.jpg

              When I get time I'll research the LS engine cylinder case parts to see if it shows different filter mount/bypass valve options.

              Rich

              Comment

              • Richard M.
                Super Moderator
                • August 31, 1988
                • 11323

                #22
                Re: Factory installed PF46 oil filter

                Since there's a different pitch measurement for Metric vs English, and I only have a English gauge, I see 16 TPI on the threads of the smaller PF46 0.750" diameter attachment hole. I don't own a Metric thread pitch gauge. I suppose I'll need to get one some day.

                I found this handy conversion chart Here ....
                Which says 16 TPI equals Metric 1.588 TPMM. I dont have a gauge with 17 TPI. The chart says 16.93 TPI is 1.5 Metric pitch.

                Metric threads are typically 1.5(course) or 1.25(fine).
                I don't know if these filters are English or Metrc, but it appears it's either 3/4"-16, or Metric M20-1.5.

                I did this to try to figure out the cylinder case/oil filter fitting sizes for the '06(PF46) vs '07(PF48) filters.

                20240323_071758.jpg20240323_071906.jpg

                Comment

                • Harry S.
                  Extremely Frequent Poster
                  • July 31, 2002
                  • 5295

                  #23
                  Re: Factory installed PF46 oil filter

                  The PF46 part number 19256041 per the manufacturer is,
                  • Thread Size: 13/16X16-1B, meaning diameter of .812 and 16 threads per inch. Guess it will not fit a 2005 or 2006.


                  Comment

                  • Richard M.
                    Super Moderator
                    • August 31, 1988
                    • 11323

                    #24
                    Re: Factory installed PF46 oil filter

                    Fitting Sizes between '06 & '07.

                    For reference, the '06 LS2 uses the PF46 Filter, the '06 LS7 uses the PF48 filter. The '07 LS7 OR LS2 uses the PF48.

                    Here are the fittings for the '06 LS2 & LS7: Parts Ref Page Here

                    2006 LS2 12552357 (M20X1.5 SAE 12L14) I'm really not sure how to read the SAE 12L14? In my last post, I was close in my measurements, M20x1.5. I believe the end for the filter is the longest end. The shorter end appears to be manufactured with thread locker added, which must be when it's installed in the oil pump.
                    0b2ffe5fcd6a3cb66de22cbf34af33d0.jpg d0a7a3d68735a50b0ab62586fd64f525.jpg




                    2006 LS7 12600225 (M20XM22) This I believe is the Metric thread sizes on each end, one in the block, other in the filter.
                    d5d7df40ac5c665e9bde1432ed30b132.jpg


                    ================================================== =
                    For 2007, the filter for the LS2 was PF48, same usage as LS7 for prior years.
                    Here is the fitting, same as above: It's for 2006-2022



                    d5d7df40ac5c665e9bde1432ed30b132.jpg


                    When I was preparing for my '07 LS2 powered for judging earlier this year, and after buying 2 PF48's from my dealer in November(he said it requires PF48), I then got the Judging Guide. It stated PF48 for the LS7(Z06), and PF46 for the LS2. I got 2 NOS PF46's(not PF46E's) and they didn't screw on as the threads were too big on the fitting. '07 is different.

                    We're all still learning about these C6's.

                    Rich

                    Comment

                    • Richard M.
                      Super Moderator
                      • August 31, 1988
                      • 11323

                      #25
                      Re: Factory installed PF46 oil filter

                      Originally posted by Harry Sadlock (38513)
                      The PF46 part number 19256041 per the manufacturer is,
                      • Thread Size: 13/16X16-1B, meaning diameter of .812 and 16 threads per inch. Guess it will not fit a 2005 or 2006.
                      Is 13/16-16 same as a Metric size then?

                      GM says it's a M20 x 1.5

                      Comment

                      • Richard M.
                        Super Moderator
                        • August 31, 1988
                        • 11323

                        #26
                        Re: Factory installed PF46 oil filter

                        Originally posted by Patrick Hulst (16386)
                        Any idea how the length of a PF63 compares to an original PF 46 or 48?

                        The PF46E is shorter than the factory-installed PF46. I know that the 63 is longer than the 48E but have not compared the size to an original 46.
                        Patrick, I found it here on Jegs site. Length = 4.78"

                        065-pf63.jpg

                        Comment

                        • Patrick H.
                          Beyond Control Poster
                          • December 1, 1989
                          • 11643

                          #27
                          Re: Factory installed PF46 oil filter

                          Originally posted by Richard Mozzetta (13499)
                          Patrick, I found it here on Jegs site. Length = 4.78"
                          Thanks Rich.
                          The PF 63 arrived today, and it’s definitely longer than the PF44 or PF48.
                          I’m tempted to take one of my PF44s and see if there is a current day ACDelco filter of the correct length…
                          Vice-Chairman (West), Michigan Chapter NCRS
                          71 "deer modified" coupe
                          72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
                          2008 coupe
                          Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.

                          Comment

                          • Joe L.
                            Beyond Control Poster
                            • February 1, 1988
                            • 43219

                            #28
                            Re: Factory installed PF46 oil filter

                            Originally posted by Richard Mozzetta (13499)
                            Chuck, I also did the exact same thing before the Regional. I bought the identical filter from another Ebay listing.

                            It was hard to see the actual diameter but I took a chance. It was too large. I looked up the part#, it listed it for a 1977 Pontiac Ventura 4.9L.

                            Then I did it again. I bought 2 other NOS PF46's from another seller. Those were correct diameter.

                            I pulled off my brand new PF48 that I got from my GM dealer, and went to install it.

                            It wouldn't screw on. The thread diameter was too small !

                            Then I realized that the GM Part numbers were the key. I looked them up and discovered that PF46 was used for several make & models oofother GM vehicles, but not Corvette. I could not understand why they would have the same generic PF number associated with several different part numbers.

                            I have some notes, measurements and photos I'll add later.

                            Rich
                            P.S- the service replacement filter for our LS2 is PF48E now. My Parts guy told me it covers both LS2 and LS7.


                            It is part# 12690386
                            GMPartsGiant.com offers the great deal for genuine GM parts, 12690386. Filter Assembly, Oil. All parts are backed by the GM's warranty.

                            [ATTACH=CONFIG]121492[/ATTACH]


                            It notes replaced by 19433934

                            That is...


                            Rich
                            P.S maybe Joe L. can educate us on this oddity.
                            Richard------


                            Yes, the GM "long number" is the key. There may be several GM "long numbers" associated with a component that is otherwise identified by a single AC Delco "short number". For the most part, the "long number" is component-specific while the AC Delco "short number" is application-specific. It is rather unusual, though, for a component with a certain AC Delco "short number" to not be usable for all applications catalogued for the "short number". However, that's apparently what happened here. Here's what I think happened in the case of this PF-46 filter:

                            First of all, as you mention, few AC Delco components are catalogued strictly for Corvettes and this is especially true for items like oil filters. The AC PF-46 has many non Corvette applications including many other GM car lines as well as, even, a few non-GM models.The original GM "long number" was 6439857. This was discontinued in November, 1977 and replaced by GM #25010325, the filter shown on Chuck's post, above. The 25010325 was discontinued in July, 1980 and replaced by GM #25010633. This was followed by GM #25014748, 88984215, 19210283, and, currently, GM #12731172.

                            Someplace along the way, the filter diameter changed from the "large" to the "small". However, based on it's design, the "large" configuration" would still work just fine for SOME later applications in which the filter's major diameter would not present a fitment issue. Here's how that can happen. When a GM "long number", a spin-on filter in this case, is superceded by another GM "long number", the new part number will SERVICE all previous applications for the superceded part number. In other words, there is REARWARD compatibility. However, that does not necessarily mean that there is FORWARD compatibility for stock of the older part numbers. In the vast majority of cases, there is such compatibility. In this case, there is an exception, at least insofar as it applies to Corvette applications. I think that GM should have changed the AC Delco "short number" when the change in filter major diameter was changed but they didn't think so. Probably, because the rearward compatibility issue was much more important to them than the forward compatibility of old stock.

                            As far as the PF-46 versus PF-48 issue goes, as you and others have found, the PF-46 and PF-48 are definitely not interchangeable. Among other reasons, the PF-46 uses 13/16-16 thread size while the PF-48 uses M22 X 1.5 thread size. Since the thread size is different, other differences are moot.

                            The PF-46 is applicable to 1997-2006 Corvettes with LS1 and LS2 engines. The PF-48 is applicable to 2007-2012 LS2, 2007-2008 LS7. The UPF-48R is applicable to 2011-2012 LS7 and LS9. The PF-64 is applicable to all 2014-2019.
                            In Appreciation of John Hinckley

                            Comment

                            • Joe L.
                              Beyond Control Poster
                              • February 1, 1988
                              • 43219

                              #29
                              Re: Factory installed PF46 oil filter

                              Originally posted by Harry Sadlock (38513)
                              Actually I think it's about 5 filters.

                              Just got off the phone with Chevy parts. For a 2006 with a base engine and Z51, the most current part is a PF46E 12737094. The prior number is 12731172.

                              Amazing
                              Harry------


                              According to my information, the PF-46 is still available under GM #12731172. However, I suppose it is possible that it has now very recently been replaced by the PF-46E, GM #12737094. Both of these filters had been available for quite some time. The only difference between the PF-46 and PF-46 E is that the PF-46 has the base plate directly tapped for the oil filter connector fitting while the PF-46E has a threaded insert in the base plate for the fitting.

                              Supposedly, the threaded insert is used to make the filter more recyclable. However, I fail to understand how it changes recycling potential from the direct tapping design. This same "threaded insert" design is being phased into a lot of other AC filter part numbers. Personally, I do not like it and avoid it, if possible, when I buy oil filters. To me, it just represents another possible failure point which is eliminated with the direct tapping design.
                              In Appreciation of John Hinckley

                              Comment

                              • Harry S.
                                Extremely Frequent Poster
                                • July 31, 2002
                                • 5295

                                #30
                                Re: Factory installed PF46 oil filter

                                Thank you Joe, yes, as you said the vehicle is PN driven.


                                Comment

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