Hi, im Armando from México this is my first time on the forum...i have a Chevy Luv 80 i love my truck and i'm really happy to have found this great forum.
The Luv gave some engine problems so i decided to make a full overhaul, at first instance the truck worked great, great compression and power way to different to the way it was before the overhaul

...but then it started to leak oil from the respirator on the valve cover, i don't know what to do since all the mechanics right here aren't so good...some tips from where to start checking would be great, sorry about my bad english thanks!