I noticed that although the cases I'm going to use have the mods done to the windage and oil pickup, the holes in the timing case haven't been plugged up. Does it matter how you plug the holes? Should the holes be tapped and a short set screw with locktite be used? http://www.tacomascrew.com/s.nl/it.A/id.19566/.f I also saw mention of the plugs. Which I assume you don't thread and just drive into the holes? http://www.tacomascrew.com/Products/Socket-Pipe-Plugs/025-905-1_4 I haven't found brass ones yet, I assume brass has similar expansion characteristics as the aluminum? And what size?