I'm lost!
What do you mean, "the pump can't even prime the system?". These are not self-priming pumps.
How is changing a barb from 3/4 to 1/2 going to help? It's only going to add to the total restriction (not a lot though).
How did you get less flow from running heatercores in parallel? How do you figure that it'll all work better in series? It's only going to add more total restriction!
:shrug:
What block do you have?
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