400 oil mod

go to the hardware store and purchase two 1/8 set screws. drill a hole in both feeds to the heads into the lifter oil gallery. tap and install set screws with sealer into the first hole like in the pics. if you are installing new cam bearing at this time turn the #4 upside down and drill the oil feed hole from the main to it, this is not needed but the #4 main will get better/more oil to it if it's done.