The NHRA is already making some moves to ensure the nitro teams are playing by the spirit of the rulebook. A source close to the situation told CompetitionPlus.com the NHRA confiscated cylinder heads from a few of the leading teams following the NHRA Amalie Oil NHRA Gatornationals. We are told this was merely to check those units in competition in comparison to the ones submitted for approval. All cylinder heads were found to be in compliance.