I replaced the valve cover due to a very small oil seep/leak, I bought the ebay cheap cover, all looked pretty good upon receipt, but leaked really bad upon install. so went to original cover with new gaskets, now it still leaks pretty bad, I did all of the careful cleaning, and tightened in pattern and final torque. now I've ordered a name brand one for $300.00 hope this does it. anyone else have these issues sealing up an N55 valve cover?