Need to check with the engine builder who put the pistons on the rods but 3 of the pistons have the writing towards the engine number side of the block and one the opposite way round, other than that I think it went fairly smoothly.
One or three of those pistons are installed wrong !!
The writing should include "Front" or a little arrow to denote which way the piston should be facing (towards the water pump end).
While some poo-poo thrust direction, pistons do have a front and a back...