Oil leak behind the cam

I cleaned it three times. Once when I got it back, once after chasing threads, and again while prepping for paint. First two cleanings were more thorough than the last, rotated the block on the stand to let the brake cleaner drain out and take any debris with it, and compressed air.....LOTS of compressed air at any angle I could think of. Then it spent its life inside a bag until the heads and intake were on. Even now, I have the intake/exhaust ports taped up, as well as cooling passages. I don't trust myself because the way things go around here, I'm liable to drop a bottle cap where the sun don't shine.