If you have a big pump, parallel can work. I used a 560 gph pump with 3/4 inch hose. Split it with a Y that necked down to two 1/2 inch legs to the two water blocks. Recombined to 3/4 inch to the radiator. The 3/4 inch gave me volume, necking down to 1/2 inch gave me velocity. System worked well enough to put me at room temp at idle and 2.5 degrees above that at load.
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