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I just recieved my new pistons and rings from the machine shop for my NA l28. I had to have the walls slightly honed so I required oversized pistons. I recieved a set from safety pistons with hasting rings. The part number is "SP123 -2 nissan (datsun)81-83 : 280zx 6v 81-83 : l28e eng 2753cc / 86.0 mm" The set of pistons I got from the machine shop were dished unlike my original flat top pistons and my uncle, who I'm building my car with, said that's how they are supposed to be even though it will lower compression. Through all the reading and searching I've done I thought that you only really wanted flat top pistons on the NA set up and dished pistons for turbos because of the lower compression. So my question is, are these the right pistons to be using or am I supposed to have flat tops for my set up. I've had the head machined .005" and the block machined, I need to figure out how much material the shop took off the block but it's not much. Im also using a fel pro head gasket which I've heard it is slightly thinner than stock. My uncle said we needed to use dished pistons because of those modifications is this the case? If I do need to re order pistons what brand should I get or who should I order them from? Thanks in advance for the help and input it's much appreciated! -Noah M