Hi all! I'm new to actually posting within the forums, but I've been researching great information on LS1Tech for years! LONG story short, I'm putting a 6.0L Gen4 LY6 in a '59 Cadillac. LS3 heads and intake. Race-built 700R4 transmission. I had to transition from a DBW GM throttle body to a DBC Holley throttle body in order to get the mechanical actuation needed to operate my 700R4's TV cable (all good now - PSI Conversions has been phenomenal to work with on the ECU/harness side). The new throttle body came with a PCV port, and I'm now to a point where I'm ready to run my PCV lines. I've done lots of research, but haven't yet struck gold on a "perfect" diagram that incorporated a DBC throttle body and an LS3 top-end.

See attached diagram (I also attached a few pictures of the referenced ports). I stole the original diagram image from Flag Motorsports' website and altered it for my application. From everything I've read, I believe this is the correct way to route my PCV lines. Can anyone out there confirm? Also, any recommendations on good sealed catch cans to use?

Note - I x'd out the rear intake vacuum port because I'm utilizing a standalone vacuum pump to operate my other under-the-hood accessories.

 

Your diagram is how my catch can is set up.

 

Thank you! Makes sense to me. Fresh air pulled into the passenger side head, down through the case, contaminated air (and pressure) up and out through the driver’s side head, passed through the catch can, clean air back into intake.

 

My mistake, that's not how mine is set up. The drivers rear valve cover runs to the throttle body. The passenger valve cover runs back into the catch can and then into the intake. I have a Mighty Mouse which acts as a PCV valve.

 

Got it. Exact same principle though - you’re closing the PCV system loop, just with an opposite flow direction of what the above diagram shows.

 

Yeah, most don't realize the simplicity of the system.
Fresh air from AFTER the MAF if there, to one valve cover, thru the engine picking up nasty fumes and crud, out the other valve cover thru either PCV valve or small orifice, then to manifold vacuum source with or without a catch can en route. Dun!