I just bought one from the parts store that fits the grommet diameter. Seems to work fine. The crankcase helps push on the valve to open it and thus allowing the pressure to escape into the carb and burnt through combustion i wouldnt think you would need a different one for various levels of vacuum
Looks like the two across the front are breathers and maybe one also serves as the oil fill. The pcv valve is in the back on that right valve cover. I know most of those brand valve covers like that have 20 holes in each side, for what idk lol
:lol:
