The plans call for one 90 degree pre-formed heater hose to route the overboard vent (left side) down to the firewall stiffener below. At Kragen I could only find hoses made for specific engines, so I picked on with two 90 degree bends. It may actually work out better, if I find I can use the second one on the inlet side. I suspect I can. I also located and drilled an 11/16" hole directly below the hose to allow for the 5/8" aluminum overboard vent tube, soon to be installed. Finally, I riveted the oill breather to the firewall.