Stock/Factory Stock Showdown Competitors;

Effective immediately, all Stock, Factory Stock Showdown entries are required to use OEM or NHRA accepted aftermarket replacement pistons. NHRA accepted aftermarket replacement pistons must match the piston submitted and accepted by NHRA, in dimensions, shape and appearance, without exception. The discovery of any piston that does not match the NHRA accepted aftermarket replacement piston as submitted will result in disqualification from event and/or further disciplinary action.

NHRA Technical Services Department