Facts and Figures with details and show NHRA if they made an error. You must play by their rules..
More mid-year horsepower and index adjustments
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8/10/2009
Following further review by NHRA, 99-02 GM 346 305/310 – factor for non-ram air combinations returned from 369 to 364 due to a recording error that had listed the trigger runs as non-ram air combinations where upon further review the trigger runs were a ram air combination.
http://www.nhra.net/content/sportsma...7776&zoneid=85