Yes, that was my co-worker Aaron that you spoke with earlier.
Just to clarify, we do not re-machine older turbine housings that were originally machined for a different turbine wheel. As a turbo manufacturing company, it is not economically feasible to shut down the production line, retool the machine, and cut the one housing. Each turbine housing rough casting, is machined specifically to match the contour and dimensions of the turbine wheel.
Mike is also correct, the clearances that are machined are very critical and will dramatically affect spool up characteristics if not done properly. In some cases it is impossible to re-machine the housing for a different wheel because of these specific contours. Meaning, material could have been machined out in the beginning, that would need to be in place for the different turbine wheel.
However, as a solution, if you can measure the inducer and the exducer of the turbine wheel, we should be able to match up a new turbine housing for your turbo. Or at the least, you could source a correctly machined used housing.
Here is a picture that shows where to measure the turbine wheel.
http://www.turbobygarrett.com/turbo...ed_Images/Garrett_rotating_group_enlarged.jpg
I do know that almost every TE63 turbo produced for a Buick, whether it was by us, or by Limit, featured a P-trim turbine wheel. The measurements for a P-trim turbine wheel should be,
Inducer: 2.920"
Exducer: 2.542"
The correct Precision .63 A/R turbine housing part number is
THB3-76.
Hope some of this helps.
Patrick