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I worked at the main Pontiac plant complex as a co-op student going to General Motors Institute (now Kettering University) back then (71-74). One of the engineers had a 4 speed Grand Am with a SD in it (his name totally escapes me, not Herb Adams, although he was an instructor at GMI).
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If only that car survived!
GTO DON probably has more info but I believe they made 2 of those before they cancelled the SD engine option in the A-body line and redirected them only into the Firebirds. Cars Magazine voted that car the Performance Car of the Year and it went to print even though the car/option was cancelled.
http://www.abodysite.com/73sd455lit.html
http://www.highperformancepontiac.co...gto/index.html