Piston play in cylinders

[J13eck]

Basically im putting together a .20 bored over 4g63. i put one piston in with the rings all compressed but there is still side to side play but the way the crank goes there is no play, like forward and backwards. and i dont believe the piston size or bore is wrong but this play is making me think.

is this right?

[Benefit]

no

[redrumracer]

like whats moving? the connecting rod or the piston? universally ill say no