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Wanted to buy std rb25 pistons

I'm chasing one std piston for A rb25 series 2 just standard 86mm if someone had gone forgies and had them kicking around still in the shed much appreciated cheers ben 

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Ooo yeah rightio well then that may be a bit painful to work out is there anything stamped on the factory piston I should be looking for I just don't really wanna spend a ton of money on this thing I just wanna refresh it but I've pulled it out and I got one piston cracked ringland so I was spewing a bit 

Do you have a nissan wokshop manual? The pistons have the grades stamped on the top. Been a while but there's i think 4 sizes for the diameter, and i think sizes for the pins too, and then a few sizes for conrod to match the piston. The codes and grades are explained in the workshop manual.

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