Piston piece

Are those hypereutectic pistons?

Did you do the math example=bore 4.060 x .0065=.026 for street natural aspirated.

If not the ring ends butted together and broke the land above them.


Buy 1 piston and lighten to same as the rest, hone & clean the cylinder and install the piston/rings [properly gapped] a new bearing and your good to go, though if the bearings good you could reuse if desired.jmo

By the way, nothings wrong with installing a piston with the notch backward UNLESS the valve reliefs are insufficient in providing valve clearance.
It'll actually pick up the torque a lil=less friction, see they put a lil offset in the pin bore as to keep the piston against the cylinder wall to keep it from rocking around=making a lil noise, the kind grandma didn't wanna hear out of her new car.