I think the orofice in the fitting is pretty small. Mine has to run a good 30 sec. or so before I see oil up top. I believe it has to fill the rocker arm shaft first and then it comes out around the arms on the shaft. There is an overflow about middle of the r. arm shaft that flows after the shaft fills up. Its not excessive but you can see oil running at all arms around shaft. I HOPE thats the way its supposed to be. If it sprayed all over I think it would leak out of the valve cover vents.