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Dave @ Jan 3rd 2008 8:30PM
GM can build their small block chevy (SBC) pushrod engines much cheaper than a DOHC engine. And with Toyota breathing down their necks, they need every financial advantage they can get in the pickup truck wars. So they won't be discontinuing that line any time soon.
Between the SBC, 3.6, GM's upcoming diesels, and dual mode hybrids, there isn't really a huge need for this new engine. (A dual mode DI 3.6 would provide impressive economy and performance in a large Caddy while also providing the DOHC valvetrain required by the marketing dept)
Its an understandable business decision.
In addition, GM just introduced the new ZR1 with a pushrod engine. The original ZR1 was the 80s poster child for DOHC.