The body shop was done fitting the engine, so I brought it home to start cleaning it up and to figure out how it will all go together. As I was cleaning the block, I found it was stamped "K20Z1". This was a surprise as it came out of a 2002 RSX S-Type so it should have been a "K20A2". The K20Z1 is the engine in the 2005-06 RSX S-Type. The transmission was labelled "X2M5" which is the correct transmission for a 2002. I know the car ran fine before we took the engine out of it, so I am not really concerned. I just need to confirm which ECU and wiring harness I have, as they are different and I need the one for the A2. I am assuming that is what I have. The K20Z1 is actually a little better engine as it has better cams and makes 210 HP as opposed to the K20A2 which makes 200.
I contacted the original seller who was selling the car for his mother. He couldn't believe it had a Z1 in it. His mom had bought the car with 30K miles on it and the engine had never been swapped since she owned it. I can only imagine why a car with less than 30K miles had the engine swapped out for a newer one. :hmm: