check with your parts supplier to see if you can get them for a J13, this is the engine that was used in the 520 and 521 pickups, along with some of the 410 and 411 sedans, and some Nissan forklifts.
they were/are available in std., 0.5mm, 1.00mm, and 1.5mm oversize.
the bore diameter is the same, the distance from the top to the center of the pin is the same, the pin diamiter is the same, they even use the same rings . the only thing different is that the J series engines had a split small rod end that retained the pin with a bolt where as the A series pins were pressed into the rod, NO BIG DEAL. it won't affect the performance or durability at all.
the only thing you will need to check is valve to piston clearance, but then there is plenty of thickness in the piston head if you need to have them notched.
good luck.

Tell me, is it possible to use the A10 engine flat top pistons on the A12 engine? Will it do any good?

Ricardo

if you want a cheap option, I used 78mm Mazda E3 pistons. The little end of the rod needs boring to 20mm as the Mazda gudgeon is 1mm bigger. We had to cut notches in the top for valve clearance. You may find the top gets a bit thin in the deepest part of the notch to give adequate clearance- especially with a high lift cam. These pistons are cast ones from ACL, not as strong as forged ones, but I couldn't afford $1000+ for forged ones.

does anyone in NZ know where i could get some brand new flat top pistions and how much $$$
cheares matt