they look like 795 pistons. Probably put that spacer in there as a cheap way to lower the compression.
I always lmao when I see people say the "long rod" increases displacement, or otherwise changes ANYTHING other than the rod angle.
The stroke is determined by the crank, not the rods.
If you put a +5mm long rod, stock stroke crank in a stock bike, with stock bore size how exactly do you have more than 350cc's?
Just exactly WTH is a 370 long rod anyway?
sorry for the derail