speedway pistons

I have a set of 3 5/16 x 3 3/4 pistons from speedway here. I just realized they don't have any front markings as usual. Did some measuring and it seems the piston pin bore is right in the middle, not offset. Do they mount either way, even in 8BA's?

 

Not all pistons/engines used offset pin holes. But give Speedway's tech line a call to make sure. No markings normaly mean either way though.

 

Thanks John, I called them and they said it doesn't matter if there no marks.