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b21 pistons in a b20??? 120-130

I agree with the above. Can I get away with installing hardened seats on only the exhaust? I'm on somewhat of a budget on this build and am trying to stretch the last bit of funds on machine work. Also, i measured my cylinder bores and they come out to just under 92mm. Right around 91.88mm. I measured my pistons and they are showing up as 91mm. I thought b21 pistons were 92mm? They also have a slight dish in them. Could these be different pistons? They say "Mahle 92D8" on the bottom of them. Tried searching but couldn't find anything on those numbers.






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