I am in the process of putting together an 86 gn motor I just bought, but have one question before I start. The block had been machined by a local shop that does many TR's. It has main studs installed and 2 center billet caps. The 3rd cap however when set down in the registry is loose. It can be moved from side to side. I am just wondering if this is alright or if they ground material off the sides of the cap for some reason?