http://www.caranddriver.com/carnews/14532/bye-bye-to-gms-v-8s.html
“The replacement of the Northstar, that cancellation was the direct result of the 35-mpg fuel legislation.” GM chairman Rick Wagoner says when the new V-8 family program began, “there was more optimism than we have today,” that V-8 engines could survive in today’s regulatory climate. The engine was to go into production next year, prior to phasing out the Northstar V-8 that is found in many Cadillacs, that is scheduled to be phased out in 2010.