[strictly]

Ok thanks, that reinforces what I've read before as a general rule of thumb as otherwise the rings will just break.

End gap I'm sure I can google/use the search function.

That really only leaves the okay to use the "85mm" piston rings question...

I'm the meantime I might just buy a box as at least I can see if the pistons pass the ring land 0.004 and then general dimensional tests