If it helps I ran -12an hose from each valve cover to a breather catch can. I had to have a guy weld on the male -12 fittings to the valve covers. Came out nice. I plugged the PVC on the intake. Set up is Dart 408, with a Procharger. I will try to find the link to the breather that I used, it had two -10 or -12an available.