If the fit is only loose by .001" you may be able to use Green Loctite or an equivalant "Flange Sealant". Talk to an older machinist. I don't see how it could be any more than that from applying a coating unless there was a previous condition that you missed. I would be more worried about surface hardness if the high temp coating process caused this problem. Let us know who did this job so we can avoid this on other cars. Brian W. [Non-text portions of this message have been removed]