I mention it Byron because it's fun to rev you up! Your a hair splitter and the general consensus it that they are in fact Chev engines (right or wrong).
It's just like you bang on about Statesman's not being a Holden etc. If you use a search engine you will find the Gen III LS engine and Chev as one in the same.
It matters not, I just find it funny you need to mention that YOU know it's not a Chev....