i'll have to look at my pic files from last summer for the top of the piston.. He did say it was a new style piston but after I texted him these pics the communication stopped..
It is still working however. I looked at the piston last saturday and its still doing pretty good no carbon build up and only wearing on the bottom corners of the skirts.
We looked at it because it started rattling like it needs a crank bearing.

It was planeaddicts and just so you know I would still buy from them they were fast and fair. But i'll refrain from sending an engine that way.