i have a 1980's vintage 3 hp briggs ..my question is what i am calling the valve cover , a small rectangular shaped cover on the side on the engine...this cover is missing the gasket but the cover also has a 1/4 hole in just the front of the cover...what is suppose to be there...has to be something missing...can i just braze it closed or is it missing a breather of sorts ?..it does look as if something was there at one time..this was a roadside pickup going to the trash so i picked it up and it does run i just need to get some small things repaired and its ready for summer...thanks for any help