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piston grade


boarderline

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I am working on rebuilding my rb25. I found a few pistons with broken ring lands. I am ordering new pistons but they need to know the grade of piston. Are one of the numbers on the top on the piston what grade it is? I am pretty sure its a grade 2 because there is a 2 on the top of the piston but I am not sure if that is where they have it stamped.

 

PISTON.jpg

 

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