I had a 140 amp LT1 alternator on my 87 GTA (with the serpentine belt drive setup) using the adapter bracket from a B-body car. The 140 was great but I came across something even better. It seems as though the new 130 amp Delphi alternators GM uses on the 8100 V8 vortec engines will fit on the 3rd gen F-body V8 serpentine bracket. You will have to change your alternator plug to fit this new style unit; enlongate one of the serp bracket holes and use a smaller bolt so this alternator will bolt on; fabricate some kind of a rear support bracket to help support the back of the alternator so the serp bracket won't eventually break; and change the pulley that comes on this unit (because it may be a 7-rib) to a 6-rib pulley to fit the F-body's serp belt.

Something I noticed about this newer-style alternator is that it seems to have a higher charge output at lower RPMs compared to the earlier CS-series units.

The ACDelco P/N for this 130 amp alternator is: 321-1813.
Here is a link to a picture of this alternator: http://207.74.147.153/servlet/com.en...rtnbr=321-1813

I will get pics put up on my website soon of this alt installed on the car.

 

got some pics up of it installed on the car: http://dtcc.cz28.com/gta/delphi.htm

 

Cool stuff! Would you be interrested in writing a tech article that I could use on the IROC Homepage?

 

perhaps, email me and let me know what you need me to do.

 

Email sent. Thanks.

 

That would be nice to have, but sounds like to much work.

Or maybe I'm just lazy.

 

Excellent information. Please note that the "rearward" facing brace was actually a GM part on the 1988 (only) V8 serpentine system. Unfortunately, this brace is no longer available.