Is it important where on the valve cover I should drill my hole to make my new breathers? I am using a catch can so all I am doing is fitting a AN fitting with hoses to my catch can on the firewall. I was thinking it would look clean by having them on the front face of the valve cover instead of on top like conventional valve covers.
Is there any reason this is not a good idea? From what I understand, the catch can system is used to vent pressure in the valve covers and this would mean the location is not too important. I have tall valve covers so I should not catch much oil.

 

I have mine right on the front of a single cover. The other valve cover is untouched. I had a set of covers years ago with the holes on the tops. If you choose to do it this way, make sure there's clearance above the rockers before drilling. With tall valve covers and regular rockers, there shouldn't be an issue. Using stud girdles decreases the amount of room under the covers.

I use a vaccum pump on my engine. It sucks out the condensation from the crankcase to a puke can before venting off the top of the can. After every 1/4 mile pass, I drain about a half a cup of water out of the reservoir. I use a vaccum relief valve on the inlet of the pump to control how much vaccum is in the crankcase.

The one downside of putting a fitting on the front of the cover. There's no easy way to add oil to the engine. The valve covers are a one piece sealed cover with no holes. I need to remove a valve cover to add oil.

 

Thanks for the input, I made a call to a friend and with a nice talk decided to go this route. It definitely looks cleaner already. I am picking up the shortblock on monday and will pop these covers on with photos for everyone else to see.

 

Just a follow up post with my finished work