I am considering plumbing my GZ motorsports vacuum pump into the valley tray instead of the valve covers.

My main concern is how much oil vapor will be present. Will there be too much and cause issues with filling up the catch can, or will there be too little and oil starve the pump.

I am using an old Barton cross ram with end plates welded in to eliminate the valley pan. The engine is a 10.4" deck 426" Hemi built to turn north of 8500rpm. I am using Barton rockers and the Barton valve covers to match them. I know piping to the front of the valve covers is preferred. Going directly to the front of the intake plate will keep me from having to hack up these valve covers, and it will give me a -10 fitting right on the front of the engine that I could put a bore scope through to check out the lifters and valley tray.

What do you think?

-Dave