Balancing a 360 internally

efriedrich said

So if I reuse the stock crank and rods and use something like a kb107 piston should I still have it balanced.

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Yes the pistons are different weights.

When I put KB 107 in my 94 magnum with stock rods and crank (reworked)
The crank need mallory added to the bottom end.
The balance only run $250 and I kept it external.

I would recommend balancing if there is a 10 gram difference on piston weight if using stock crank, and rods.