Hello again. To SSEBONNE4EVA, from what I have learned so far, it looks like all of the later years will have the .625" EGR tube in the LIM. In fact, my GOOD (finally) GM dealer parts guy researched it on his computer, and here are the numbers: 24502743, changed to 24505728, and that then changed to 24508923. So, there is the progression, and he appoligized for not being able to tell at what years, or serial numbers, the changes were made. (-and from my experiences, part number changes are not always totally clean and sharply defined anyway, sometimes with a lot of overlap either way)
Anyway, 24508923 is the latest number. I didn't price the part, but I'd bet it would be pretty spendy. Also, to answer the question some have had about buying just the EGR tube by itself. GM definitely does not show that part as possible to purchase separately.
Which quite frankly, I don't find the least bit surprising, I mean afterall, do you really think that the average dealership line mechanic is likely to be able (much less have the tools) to extract the factory pressed-in tube, and correct press fit a new one?
Say, Bob, GOOD JOB on your UIM modifications
Honestly, I think you have just come up with a most EXCELLENT
And the obvious beauty of using your method is that it makes absolutely no difference what size the LIM tube is, PLUS the added BONUS is that you don't have to go through the hassle of replacing the EGR tube.
True, the hole cost you $30, but hey I think that is a bargain. In my mind, from a "basic machine process" point of view, it would be FAR SAFER to enlarge that hole using a "reamer" (not a tapered reamer, obviously, but a "parallel" type), but not a twist drill. A twist drill, even in a drill press setup, can sometimes "grab a whole big hunk of material" and make a total mess out of the part. ESPECIALLY when it is most likely that you will be breaking out into a coolant passage. But then again, you are talking about a tool that is pretty expensive, and certainly not available at your local hardware store. -guess I'll just take my chances with a twist drill.
Anyway, just my comments. GOOD JOB EVERYONE !!
(gee, if GM only had such a good source of information, advice, solutions, etc.,,,, -or maybe they do, but just don't listen very often??)
Say Bob, if you don't mind, I will adopt your method on my next job. (-in fact I still have my old UIM from my '99, which I might just as well go ahead and modify right now.) I can have it all done and ready to use on my brother'* '98 LaSabre.