I have a 396 that is sucking oil in the intake from the valley area. It is a fresh rebuild and i have pulled the intake three time with different gaskets each time. I even used wax wire to check the angle of the intake to the h e ad. .i did have to sand the in intake to fit. I now have a very even crush on the felpro gaskets . I put it all back together and test drove it 30 miles. It was still burning oil. I pulled the intake again and the is oil in the intake runners . What the hell us going on. Bad intake. Bad heads any in put would be great