Plastic on 77 440 block??

Engine, Transmission & Driveline

  1. mopar440

    mopar440 Well-Known Member

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    Just pulled this 77 440 out of a RV. On the pass rear of the block, I noticed a coating that was cracking. I pulled on it, and it snapped. It's brittle but hard. I first thought JB weld fixing a soft plug, but there is no plug undernieth it, and no cracks noticed yet What the heck is it? It's semi flexible, and has a grey look where it breaks. Just on the rear of the pass side

    IMG_20210405_163812931.jpg

    IMG_20210405_163826493.jpg
     
  2. Luke Pokrajac

    Luke Pokrajac Member

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    Doesnt look like undercoat, that's for sure.
     
  3. mopar440

    mopar440 Well-Known Member

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    Definitely not, Its really weird
     
  4. 440sportfury

    440sportfury Active Member

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    It looks like grey marine tex. It is funny I was changing a starter in a 68 dodge dart 318 years back and it encountered the same thing. It was the previous owners mechanics answer to fixing a freeze out plug that didn't pop out correctly and had a crack. I cleaned it up took out the freeze plug replaced it and it still leaked. I bought grey marine tex sneared it over the pug on the block and drove it for 2 years about 18,000 miles
     
  5. 68PK21 440.6bbl

    68PK21 440.6bbl Old Man with a Hat

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    Looks like chop spray fiberglass...
     
  6. savoy64

    savoy64 Member

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    was the motorhome fiberglass ---maybe overspray...
     
  7. WissaMan

    WissaMan Well-Known Member FCBO Gold Member

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    you might have to ask on the "ForMotorhomesOnly" forum :rolleyes:
     
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