Hello all. Searched a little an wasn't able to find out what I'm lookin' for. On Acura's diagrams online, I can't find what I'm lookin' for either.

I'm prepping my ride for LS/Vtec right now and am going to rebuild this GSR head for that purpose. While my head's being worked on I just have a few questions....

1. What sensor is #1?
2. What belongs here.....on #2?
3. I found a good amount copper shavings in the Vtec solenoid's screen. A bunch more than what you see in the pic. Should I be worried about this as I have no clue really what the head's history was. I do know however that the car was running good when the head was pulled.