Interesting spot to put heatercore. A couple of comments:
The combination of those little blocks with socket clips to mount them and hose torquing the blocks in different directions gives me the fear. Be careful with that.
I would personally have run the blocks in series to try and clean up the hose and to get higher flow rates through them. If you are set on the Ys tho, at least try and find/make a y for the pump inlet that is 3/4" x2 1/2" and then use a little run of 3/4" hose to the pump. The bend plus the Y + 1/2" hose all at the intake is a hydraulic disaster. It looks like you are using a bleed tube to fill up top. You might be able to kill 2 birds with one stone by making a pump-res for the inlet that has 2 barbs for return from your split loop. That will fill a LOT easier too.
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