Oil Slinger hits timing chain

that bolt has an 1/8" hole & You can drill a regular bolt to make one but it is still a drip passage from the valley & that's why I add the .015" pressurized squirt as SB's have chain longevity probs. Grainger (& others) has the .015" bit (get several as you will break one at least!) & need a pin vise to hold it in your drill and alum pipe fittings or go REAL slow with oil into a steel cup/pipe plug. if you drill the hole in the pipe plug in the rear of the dr horizontle oil gallery then preoil with the 5/16 hex you'll see the squirt & I think it'll convince you of its bennie. EDIT they either had the bolt with the hole or a drip tray