The most popular are the CS130 alternators with a case diameter of 5.12 inches. The CS130D is also slightly larger than the CS130, but the mounting lugs are the same.

The CS130D designation remained with the introduction of the LS engines, but GM changed the mounting lug pattern, which unfortunately limits its interchangeability, even within LS engines.

9. There are tons of choices for aftermarket alternators, and we went with a Powermaster 12si-style unit, offering 150 amps and a simple one-wire hookup.