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
View attachment 451458
View attachment 451459
