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#9
05-10-2006, 05:09 PM
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Re: 70 GTO RPO codes question
The 455 in the GTO was rated 360 HP, in the big cars (Bonneville/Grand Prix) it was rated 370 HP.
Although the engines were the same, Pontiac rated it differently for the different models, they didn't want the power to weight ratio to be too much for insurance purposes or AMA,or whatever. 
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