Hi buddy! The (2) hoses from each breather would need to be T'd into each other THEN a single hose from that T routed to a common breather or pan evac etc other wise you'd have vac pulling equally on each valve cover side which ain't give any flow cuz there wouldn't be any pressure differential which is required for something to move/change. EDIT total brain fart on my part/CORRECTION: vac should go to only ONE valve cover