In this case, I believe that the temperature difference in the coolant (3-4C) will give a better gain than the flow gain from series (probably 1C in those blocks). It also allows him to stick to higher tube ID (5/8" to match the HC) throughout the rest of the system, further reducing head loss (and increasing flow rate!). Parallel is win-win in this case.
Also keep in mind that in series you are also going to eat up more pump head than parallel due to the higher flow rate per block.
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