i'm building an engine at the moment using a 81mm bore. i have a piston which looks just like a sr20 one but is about 81-82mm, with the same compression(by looking at it). It has 58 Y stamped by the gudgeon pin hole on each side and 45-1(nissan symbol) 60j41-2.

Does anyone what nissan engine this came from and the exact specs would very much be appreciated.

thanks.