I was drilling the holes to 3/8" for the engine bolts and noticed that the gusset (F-601C) in between the firewall and the WD-602 Upper engine mount bracket cracked in a couple of places. You can only tell looking in the hole since it is sandwiched between two steel plates. I then proceeded to do the other hole with a step drill being very careful and it happened again... is this a common thing? is it a problem? After a little investigation I found that piece is aluminum (.125) and is primarily a spacer between the engine mount bracket and the firewall so I am not sure if it is a problem... any help would be appreciated.