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

Discussion in 'Small Block Mopar Engine' started by skep419, Nov 8, 2018.

  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
     
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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