How to install a Valley Tray on an Oldsmobile Small Block

Valley trays help keep intake manifolds cooler by shielding the underside from oil "splashing". Big block Oldsmobile engines have tapped holes for this style tray but small blocks do not. This is how to drill, tap, and install this style valley tray correctly. It's recommended that this mod be performed on a disassembled block, not while in the vehicle.