Nissan parts deal website shows that Rocker cover as being about 700$ so i would try very hard to silicone seal it or something FIRST!
Nissan Part No.: 13264-EZ41A
COVER ASSY - VALVE ROCKER
Nissan 13264-EZ41A COVER ASSY - VALVE ROCKER
Lookup Code 13264
Part Description Cover Assy-Valve Rocker
This genuine Nissan part is guaranteed by Nissan's factory warranty.
Your Price: $701.30
Retail Price: $884.37
You Save: $183.07