Based on the year I'm thinking 3.8 and I'm also thinking an ecotec taking out a 3800 isn't happening.
Edit: Upon further investigation the 3.1 was also available in this model year Grand prix as well, for some reason I thought it was just the 3800 and the 3800 sc.
Last edited by Jroc26 : 05-11-2011 at 03:11 AM.
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