.0625 or a 1/16 inch for the fractional guys. If the bushings are already installed it’s kind of a PITA to get the holes in them but I’ve done it before.
Just protect the top of the lifter bore with a piece of brass or aluminum and I used a center drill to get a divot to start the drill.
Thank you for the info....the bushings already have feed holes that were put in buy the machine shop that bushed the bores...I will have to stop and see what size is they put in...if not a .0625 I will just follow the hole with a drill to size.