cleaning carbon off pistons

MOPAROFFICIAL said

I just remember a valve troff.
Not individually cut, just a troff like the 1st round of kb356's were but are now individually fly cut.

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Haven't seen anything like that. All the aftermarket HP273 pistons look like the oem ones that I have seen but that has been in the last 10 years. Dould have been a old TRW or Jahns or something like that. Never say never.