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B20 Piston Identification 1800

I purchased a B20B engine for my 122S and I'm trying to identify the pistons. They are marked RA 2603 020 TOP 0015 VI on the top of the pistons. I think these are std. bore but are they Mahle pistons?

If anyone knows about these pistons and what the markings mean I would really appreciated it.

Thank you in advance, Richard.







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