1. moparsquid

    moparsquid FBBO Gold Member FBBO Gold Member

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    HI been awhile since i built a motor I need to get core plugs and i noticed they come in shallow and deep ,Im doing a 383 which one should i get?
     
  2. 70rcode

    70rcode Well-Known Member

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    I also have a job coming up & will be using the Deep style brass core plugs...Seem to fit better than oem shallow type...
     
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    • R413

      R413 Well-Known Member

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      1 5/8” in the side of the block. I like deep, more surface area to seal.

      I recently use shallow ones, a few has some seepage weeping until it was driven Some and a had a few heat cycles.
       
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      • moparsquid

        moparsquid FBBO Gold Member FBBO Gold Member

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        Yea deep makes sense
         
      • ckessel

        ckessel Well-Known Member

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        Actually our stuff is 1 41/64ths" which is just a smidge bigger than 1 5/8". Also they are shallow and the Chebby 1 5/8 are deep.
         
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        • beanhead

          beanhead Well-Known Member

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          Milodon makes a nice packaged kit, USA made. Don't forget the threaded plug that goes in the bottom side of the oil passage behind the timing cover!:)
           
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          • moparsquid

            moparsquid FBBO Gold Member FBBO Gold Member

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            I saw milodon has them at oriellys
             
          • oldkimmer

            oldkimmer FBBO Gold Member FBBO Gold Member

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            Thanks for the lesson. Kim
             
          • 6PKRTSE

            6PKRTSE Well-Known Member

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            Mine were pretty porous during the rebuild on my 440. I had to machine them all and bore the to 1-3/4" cup plugs.
             
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            • oldkimmer

              oldkimmer FBBO Gold Member FBBO Gold Member

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              Holy that must have been pretty rusty. Kim
               
            • 6PKRTSE

              6PKRTSE Well-Known Member

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              Yes, surprisingly everything else was fine. Over 55,000 miles on it now since the rebuild.
               
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