MP valve covers knock out machined for pcv grommet (Chevy style)

Small Block Mopar Engine

  1. skep419

    skep419 It's only money, you can always make more

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    I was going to use two breathers and a pcv. Knocked it out and quickly found out there isn’t a grommet made that will fit. Brought it to my local engine shop and he knocked it outside of the park.

    He machined both the top and the bottom so a standard grommet would fit. It's roughly 1/2" deep and a little over 1" wide to start with. (after the knock out is knocked out)


    8829032E-3ED0-4699-8897-1F934BAA76F6.jpeg 0D0FF648-780D-4B2F-ADCB-25E8A9B46C3C.jpeg 59F26CEB-A192-40F2-915E-D45308A01963.jpeg
     
    Last edited by a moderator: Nov 8, 2018
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    • toolmanmike

      toolmanmike FABO Staff Staff Member FABO Gold Member

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      Hold my beer and watch this.
       
    • diymirage

      diymirage HP@idle > hondaHP@redline

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      gotcha
      what you really want to show off is the part that is hidden by the grommet
      why dont you take it out and snap a few pics of the machined surface?
       
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      • Bobzilla

        Bobzilla Well-Known Member

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        • toolmanmike

          toolmanmike FABO Staff Staff Member FABO Gold Member

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          And don't forget to install the baffle under the pcv valve. It prevents oil from getting sucked up into the valve.
           
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          • skep419

            skep419 It's only money, you can always make more

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            • 70Duster440

              70Duster440 Well-Known Member

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              I believe this is what would have worked for you if the breather (or whatever) requires a 3/4" hole. I have personally confirmed this on my own MP cast valve covers - perfect fit (replacing the MP PCV grommet):

              Ford Performance Parts Valve Cover Grommet Sets M-6892-F

              fms-m-6892-f_w_ml.jpg

              My photo below. MP and Ford grommets are dimensionally the same except for center hole:

              1-2-Mopar-and-3-4-Ford-grommets-Ford-Performance-Parts-M-6892-F-20184423305165.jpg

              Nice machine work, though!
               
              Last edited: Nov 8, 2018
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              • CudaChick1968

                CudaChick1968 The Mistress of Metal FABO Gold Member FABO Vendor

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                20180715_124340.jpg

                The original part number was replaced by this grommet and plug set.
                 
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                • diymirage

                  diymirage HP@idle > hondaHP@redline

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                  glad to see you found this thread
                  i was gonna direct your attention to it, thinking this might be helpful to you, but i completly forgot about it
                   
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                  • rustycowll69

                    rustycowll69 Well-Known Member

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                    glad that that worked out for you, but I think I would rather have spot-faced the inside of the v. cover.
                     
                  • diymirage

                    diymirage HP@idle > hondaHP@redline

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                    i dont know, i think it looks pretty clean the way the grommet almost sits flush now
                     
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                    • skep419

                      skep419 It's only money, you can always make more

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                      • Rock Able

                        Rock Able Well-Known Member

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                        I have a 360 with this type of valve cover. I also drilled out the "knock out" and installed a grommet and the PCV. Despite putting the baffle under the PCV, I continue to get oil into the PCV, which is causing pre ignition knock. Anybody out there come up with a better way to prevent this? Thanks.
                         
                      • rednesss

                        rednesss Well-Known Member

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                      • Rock Able

                        Rock Able Well-Known Member

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                        Thanks, I guess that would work. Looks like you just twist the bottom off it periodically and pour it out.

                        I'd really rather just come up with a better baffle design since it's strictly a street engine.
                         
                      • rednesss

                        rednesss Well-Known Member

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                        I've wondered if there wasn't a better solution for a long time too, but what could you put in there that wouldn't most likely come out and end up in your oil?
                         
                      • Rock Able

                        Rock Able Well-Known Member

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                        One variable in this equation is the distance of the baffle from the PCV. Right? Or are we sucking up vaporized oil? If we increase the distance of the baffle from the PCV without infringing on the rocker arms, wouldn't that help?

                        If we're dealing with vaporized oil, the catch can might be the only solution. Never had a problem with any of my SBC's.
                         
                      • MopaR&D

                        MopaR&D Nerd Member FABO Gold Member

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                        Oil pull-through from PCV systems is still a problem with some new cars even (modern Hemi cars for instance), one of the first upgrades owners of G3 Hemi-powered vehicles do is install an oil catch can in the PCV line. You can try to add more baffles and filters and such but the PCV will always still draw in a little oil vapor unless it's completely separated out.
                         
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                        • rustycowll69

                          rustycowll69 Well-Known Member

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                          that was one of the reasons I thought it would be better to counterbore the inside of the v. cover , to place the PCV higher in the v. cover & further away from oil slinging around, and futher away from the baffle. Perhaps, a better baffle design would help, too.
                          of course the PCV location is usually opposite the vent in the other cover: ie. if the vent is in the front left of engine, then the PCV should be right rear of engine.
                           
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                          • Rock Able

                            Rock Able Well-Known Member

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                            Good thinking. My breather is exactly as you described....yet I still pick up oil.
                             
                          • thesiren74

                            thesiren74 Well-Known Member

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                            I found some at autozone and modified them.
                             
                          • Rock Able

                            Rock Able Well-Known Member

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                            • rustycowll69

                              rustycowll69 Well-Known Member

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                              if you get on the newer mopar forums, a lot of owners are adding them to cut down on sludge formation in the engine. and keep the intake runners/ports cleaner.
                               
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                              • Rock Able

                                Rock Able Well-Known Member

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                                I installed the Catch Can today. I have a baffle 3/4" below my PCV, so anything I'm picking up is vaporized mostly. After driving about 20 miles and "getting on it" 3 or 4 times, I pulled the canister off and there was a small puddle of oil in the bottom. This engine has about 800 miles on it. I hope this gets better but I am convinced that adding this catch can is going to help my preignition situation and keep the engine cleaner.

                                Is this a problem more associated with Mopars? I've never noticed a problem with my SBC's. Thanks again for the recommendation.
                                 
                              • rustycowll69

                                rustycowll69 Well-Known Member

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                                as far as I know, it is not a mopar specific problem. It probably has more to do with epa regulations and trying to really curtail hydrocarbon emissions, not just from the tailpipe, but from the fuel tank, and engine crankcase as well. With FI, engines run pretty clean, but sludge can form in engines which don't reach operating temp for long enough period of time to burn off moisture in the engine/engine oil. This can form a sludge, some of which you might see on the oil filler cap.
                                As far as SBC being immune to this problem, you can go on the Internet and see videos of GM owners trying to clean that stuff out of the intakes with Seafoam, and other chemicals.
                                 
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