First off im biulding up a spare engine
Using old cast iron buckets as they are in great shape forgot witch side wrist pin bolt goes on
Cam side i think?
Have 3 heavy and 1 light piston
Have enough old one might get buy with light ones
But rather not think this be an issue
Last motor i used 2 and two with no issues
I know befor you lecture me i should by new but just biulding a spare on the cheap using good used stuff
Piston clearances are very good
You will have more vibrations with uneven weight pistons. They should all be light or all heavy. The bolt goes toward the cam shaft. The rods should also be equal weight.
Rods are all light but i weigh them when i put them in still fitting the babbit