I know its a stupid question, but the PO of the car said it he replaced the original with a turbo engine in anticipation of a future upgrade. When I took the headers off today, I see its an N42 and not an F54. It was rebuilt by a commercial engine rebuilder and has a p90 head, so I just want some confirmation. Maybe they used whatever block they had.
Also, looking at the cylinder walls and all the honing marks, is any other prep needed other than a good cleaning. I plan on replacing the pistons with nissan motorsports pistons and upgrading to an MSA cam, but I don't know which one yet. I am staying NA with SUs.