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You are incorrect about it being a one-piece block. It is still formed from two halves, how else would they get the crankshaft in? The asymmetric connecting rods allow the motor to be assembled in the traditional manner, with the pistons, rods and wrist pins put together outside of the block and inserted as a unit. On the EJ, the rods had to be attached to the crank before putting the block halves together with the pistons and pins inserted afterwards as the connecting rod bolts were inaccessible once the blocks were assembled. Having the bolts rotated downward allows them to be accessed from below, this speeds up the production process and makes it cheaper for Subaru.
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