The NHRA Technical Department handed down rule adjustments to two of the three power adders in Pro Modified Tuesday afternoon.

With this move, the supercharged entries will have their overdrive percentage adjusted from 16.5-percent to 14.55.

The supercharged combination has established low elapsed time in six of seven events this season.

The turbocharged combination, winners of the last three events, had their boost reduced from 36 to 33 pounds. This adjustment could slow the turbos as much as .05.

No adjustments were made to the nitrous combination.

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