Review on Dorman 264-982 Engine Valve Cover for Optimal Fit with Compatible Nissan Models by Eric Carr

Comes with all gaskets which is great BUT it fits very well. Now I have a knock in the engine. I don't know if it's the valves hitting the lid or something else. I'm going to add Sea Foam to my oil to see if that cleans it (I've read it can) and if that fixes the problem, the cap isn't the problem. Edit 3/16/2016: After watching the video provided by user James E. I found that this part failed, just like the one in this video. I have the exact same engine knock as in this video and now I have to buy the original valve cover at a higher price and it's too late to return my engine cover. Please don't make the same mistake I made when I bought this poor quality aftermarket part and buy a genuine part. However, you will need to purchase a gasket as the OEM does not provide one. When I get the original cover I will post pictures of Dorman.