Thanks! I took this pic last weekend when replacing my PCV system components which requires removal of the intake manifold. Now that everything is put back together, I ask if this was normal..........well I'm happy it is because I'm not sure I would have pull things apart another time in less than a week
Looks fine. That's just normal surface discoloration. Alloys are are prone to discolor. Deposit buildups cause the problems. The valves look tidy. If it troubles you that much, toss in a bottle or two of Regane or Techron.