I would really really appreciate it if someone could tell me where i can buy just the cylinder head? if possible through ebay cuz im in canada and i dont have time to deal with contacting back and fourth but its fine too, i need to know a brand that i can trust i wont get screw over, i am a total newbie, i love this car, i got it for 3500$ and put in 1700$ to fix it already but now my mechanic said he cant repair my cylinder head cuz its cracked, im in university and basicly broke so i need to

Alright first off this is not for me its for a family member ( nephew ) some may know of him from 04 nats im not going too go into full details cause theres to much too type   But hes in serious legal trouble and if i thought he was too blame or at fault 100% i wouldnt try too help but basicly he was present when i guy was killed and and they gave him life and 29 years now i do feel my nephew does deserve some time in jail for not going right to the police about it but he said hes not a nark i

http://www.youtube.com/watch?v=DkWXyb_qoNI&feature=related

My wideband has maybe 1,600 miles on it and was working just fine before installing it on my new conquest. I did a reset/ recallibration and the sensor itself looked pretty black when I took it out. Right now it always reads 7.4 AFR (lowest it can go) and never gives any other readings. Did I maybe foul out the sensor?