Just thought I would let you guys no that the amc head I put on my zd30 went on real well and I am happy with it so far. There is no sign of any water disappearing and the motor is running real well.I done the job myself yes a big task but well worth it , I saved over $2000 and really enjoyed it. The original head just cracked for no reason at 70000kms and no, the chip was'nt on yet as you may see on my signature. By the way the chip is awsome I will never take it of, I get more power and smoothness from about the same fuel consumtion as with out the chip, And long trips it is actually less.