bump, dont mean to bump this up..but I need some help finding what motors I have. I have a p11 and purchased a DET motor about 2 years ago(motor is the car already for a year). The head has 53J 1L. Now, I got lucky and the motor came with a gtir t28 turbo and the company said its a avenir motor and did come with a silver VC. The other code is the motor in my sentra se-r. Its 53J 4L, no egr, highport, and I just bought this car with the motor and the last owner doesn't know about engines very well, but I'm changing the axles on it and saw the block has been drilled and tapped and has a bolt in it right now. So, I've done research and those 2 head codes are not answered anywhere I looked. I did saw a thread somewhere from the old forum saying that the 53J 1L is 10:1, but that motor came turbo'd with all the lines in stock locations and purple injectors. So, if anyone found out, let me know about those 2 head codes. thanks!