Here's a pic I took with the stock LA rockers I cleaned up just now (Simple Green is awesome, mild enough to use indoors), you can see the arrow drawn on the side of the head points to the factory accessory bolt hole which just so happens to line up almost directly with the rocker shaft bolt. I intend to plumb a line with a T (or 4-way if possible) off the oil pressure sender port on the back of the block.