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Reference.org
IMSA GT classes
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<p>IMSA GT classes are former classifications of <a href="/facts/Sports_prototype/vdGLQ1bJ">sports prototypes</a> in <a href="/facts/Sports_car_racing/Htyaoyhk">sports car racing</a> competing in the <a href="/facts/IMSA_GT_Championship/8vzJcD8X">IMSA GT Championship</a>. The classes were used at different, overlapping times during the period from 1971 to 1998, over which the championship ran. </p>