My neighbor decided to hydro lock his grand caravan with the chrysler 3.6 in it. The hydro lock cracked two con rods. I'm swapping his engine out for him and was fixing a valve cover leak and checking timing on the junkyard engine. I noticed that both his old engine and the junk yard engine had a metal paste on the cam position sensor side of all four camshafts. I'm wondering if anyone knows what that stuff is?