We avoided disaster on our 5.2 Magnum build. ALWAYS inspect OOTB Heads !!!!

Those ports did seem rather narrow! That's really bad, no excuse for that to leave any place of manufacture. Even China. 65'
2 things:
  1. Heads were CAST in China. The castings look great
  2. Machining is done in Nevada to my knowledge. Machining may be ok but the CLEAN-UP was non-existent.