Hello, I still haven't received a very accurate answer to my search.
I will start assembling the engine with the M113k sleeve block soon.

But before I start ordering a forged piston for a few thousand, which according to the description is intended for a sleeve engine.
So far, I have not found any information that excludes the fact that the original M113k pistons cannot be used in a sleeve engine.

I know and have talked to many people who claim that the thermal expansion of the pistons of the original Alus block is unacceptable for a sleeve block, but in the case of a specific engine, I have not heard this experience directly from anyone.
I have found topics where there is talk about the construction of the sleeved engine, but it is a bit confusing with the pistons, so I would like real experiences or statements

Please share experiences, knowledge. Thank you

 

They can be used but if you sleved the block you might as well install forged pistons as it would be the strongest way to go.