Hey Tony -
Points all valid and well taken -- I should have made it clearer in my discussion that the references to origins and age were meant only as a comparison between the 90-degree (early 60's) and 60-degree (late 70's) families of GM V6's, and why an updated version of the latter may have been chosen for the G6.
I made no references to or comparison between pushrod and OHC designs, but I agree with the weight-distribution disadvantage commonly levied against OHC designs, along with generally more challenging packaging.
I have no real problems with GM's new V6's save for their somewhat timid power and their iron blocks. But at the same time, I wouldn't trust GM to re-engineer the blocks to aluminum without having either stiffness/harmonics issues or a hefty price tag...nor do they have any real reason to go with lighter blocks, I guess, since the typical carbuyer's focus isn't on things such as weight distribution, manual shifting, and suspension geometry. He just needs all his torque on the bottom, a smooth-shifting slushbox, a place to put his Dale Jr. or Jeff Gordon sticker, and an opening to put gas in...like you say, what sells (well, with tons of incentives) is what they'll do.
