"Surely GM has been through Legal for approval of the cylinder, or we couldn't sell it, right?!?"
In your dreams!!!! I went through MONTHS of pure hell on the "E-Rod" motor that GM advertised as "Smog legal" in Kalifunny.
Seems they forgot one step, that being getting aproval from Ca. Air Resourses Board. Yes we are a "Smog Cert. Shop" at which point we could be subject to a $50,000.00 fine and loss of license for selling a "non-smog legal" engine. A couple of other Kalifunny Dealers caught in the trap as well. Fortunately GM got off of their butt and got it cleared up but it only took them about 5 months.
