The Epic Roar Stock is legal
Per Roar rulebook:
Recently Approved Motors:
Rebuldable Stock Trinity Epic Ep1111 Epic 27, SatinBronzeCan, 4x5ldn brush, .300comm 6-04-2004
Rebuldable Stock Trinity Epic Ep1112 Epic 27, SatinBronzeCan, 4x5ldn brush, .300comm 6-04-2004
ARCOR has approved it as well. Not sure about Norrca