Last I heard (before I retired, and also from a couple of "current" GM
guys) is that it is a situation with not only capacity (60 deg V6 vs. 90 deg V6 tooling and outflow) but also percieved customer demand. Actually, the current 60 deg pushrod V6 is a highly refined powerplant (shit, it should be after a zillion years), but one would hope that all V6s will be null and void in the future because of inherent counterbalancing issues, but I digress).
To compound the production-run installation is the added expense of certification of every vehicle/engine/weight class formula for the government.
When I was @ GM
, the in-house figures for an engine upgrade/degrade for any one car line was approx. 20 - 35 million dollars. By now, I am sure that the costs are appreciably higher. If a line exec doesn't feel that the costs will reap a benefit in customer appeal, the idea won't fly.
Further to actual vehicle production expenditures, there are certain formulas throughout the platform that must be upgraded; these include brakes (caliper pressures, rotor thicknesses), shocks (usually McPherson assms), spec dias on CVs, half-shafts, and so on. Every item is an added expense.
Most folks don't even realize why there is a speed governor on a Camaro Z28 convertible. It's because the extra 16 lbs weight of the Z-rated tires would put the convertible production car into a "gas-guzzler" category via US government criteria. Therefore, the corporation elected to lower the weight by installing a lighter, lower speed-rated tire and deferring several weight-sensitive accoutrements available on the glass 'T-top' model to save the customer the extra G-G tax. We initially did this by staggering the Hall-Wheel readouts to fake the computer control of fuel pressure, but I'm not entirely sure how the latest speed governor was put into production. Guyz'nGurlz in the know how to re-chip (and hopefully install an upper Z-rated set of treads if they want to get close to 150mph on their way to work). The bottom line is that if you can save a buck at The Autos, you are a king and will get closer to the top even if you are an asshole (see most of GM
Sorry I got off-topic, but to answer your question, somebody with a calculator didn't see the benifit for the bottom-line. Have faith, though; there are some GM
mid-sizers coming out in the near future that have healthy V8s and RWD. Regards...Jack