Again, There are NO holes in the front and rear corners. I've seen so many heads (Chevy's included) with drain holes in the front and rear corners and other places. These heads have two drain holes above the corners, higher than the valves. The drain holes are near the end head bolts of the middle row. Unless the engine is supposed to be tilted (rear end down), the valve covers are going to be half full of oil before it drains back to the oil pan. Should the engine be mounted in a tilt position???