pcv

[Dragon]

My M/T's look like the should just simply knock out (already had enough plugs removed when I got them), but to be safe I would use a hole saw....   I'm sure someone else may chime in as to what you could do....

[Redneckchevy]

if u dont have a knock out I would only use a hole saw if the area is flat ..And only cut the hole as big as u need to fit the grommet ..And mask the area off..And make sure you use oil when cutting the hole and let the saw do the work so u dont dent and warp Ur valve cover. and make sure the cover is off the engine..And make sure when ur done u clean it all up so it will be free of any metal flakes

[76_Scottsdale]

don't forget to try to add a baffel to the inside of the valve cover to keep oil from sucking into that pcv