Does anyone know when Pontiac went to the series II, then III 3800? And what were the significant differences in the engines besides the intake manifolds and roller lifters? I'm also really interested in the SC versions and their development. Is there a history of this engine'* development somewhere?

I can only tell you the years.

1995 Series II NA was started 205hp 230tq
1996 Series II SC was started 240hp 280tq

2003 (Made for 2004 mdels) Series III for NA and SC for Grand Prix'*
NA 200hp 230 tq
SC 260hp 280 tq