Plastic on 77 440 block??

mopar440

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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

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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
 
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