Heh, well let me shoot from the hip here. This may not be exact, but it's close:
The GN's, Turbo TA's, T-Type Regals, etc all had the LC2 which was a factory turbo motor of 3.8l displacement. In 1989 GM replaced the "3.8" LC2 with the "3800 Series I" which, really, was physically nearly the same as the LC2 they just changed the name to fit their new four digit naming scheme. I'm not sure what the code was, I believe it remained LC2.
In 1992 the Bonneville SSEi got the first 3800 Series I with an Eaton M62, coded "L67." In 1996 the 3800 Series I was replaced by the Series II and given the Eaton designed, GM cast M90 and kept the "L67" code. In 2004 the Grand Prix GTP received the 3800 Series III dubbed "L32" - major differences are drive-by-wire, a fifth generation Eaton designed GM cast M90, and powdered metal connecting rods. All other GM vehicles with the blown 3800 (Impala, MC, etc) retained the 3800 Series II L67 with no changes.
The blown "L67/L32" 3800 Series II/III will be dead after this year, or possibly next, as GM reduces its stock of the motors. Blown 3800's have ceased production and all projects surrounding the 3800 ceased in January of this year. The non-forced induction 3800's will remain in production until 2006 and then will be dead in 2008 or possibly 2009 as GM reduces stock on these motors also.
The 3800 will then be completely gone.
Hey Marc, FYI, that red ZZP car that drives on the street went NINES tonight.