This may sound stupid but me n my cousin had this problem with his jeep. Then 2 months later had the same problem on a blazer that i had built for a guy. You can spray and spray and spray all you want to, you can replace all the pulleys you want to. but im thinkin its your crank seal on your timing cover. It goes bad and some how lets your harmonic balancer start to dig into your timing cover. I could be wrong but that was r problem on not one but 2 different vehicles. If thats the problem you should be able to c a mark on the timing cover where it rubs.
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 EARZ34
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