Saw your video about 5.9 oil squirters. I’m helping a buddy rebuild his 2006 5.9 and I’ve always noticed the blue or plastic plugs in the mains. This Eng uses bolt on style but also had these. Machine shop removed them and did there machining but never sent them back up. They did send a set but has small hole and not physically blanked. Do they need to be blanked or can they be used and not worry about loosing oil pressure?