It looks like GM has contracted Ford-owned Cosworth to supply IRL engines to replace the GM in-house designed engine. Even though the Chevy IRL engine is a recent design, it has suffered humiliation this season at the hands of Toyota and Honda. Desperate, Chevy sought a replacement and turned to Cosworth. It's interesting that when they couldn't lobby for special rules or legislated advantages to make their cars winners, they gave up on their engine. I'll bet you won't hear the term "Ford-Cosworth" mentioned much now! How neat it would be to see those IRL Chevy engines with "Chevrolet Powered By Ford-Cosworth" on their cam covers. I suppose Ford allowed the contract to go through to help their current financial situation.