Radiator and hoses replaced. New Honda coolant. New rad cap. Inspected thermostat and all working perfectly (did hot water test). The block tubes and thermostat look pretty much new. No leaks anywhere.
Just looking at the engine layout, there is a 1 to 2 foot climb from the block to the heater core. So maybe it is just crazy difficult to remove the air bubbles in the heater core. I don’t even see how jacking the car would make them come out. I guess I’ll just have to live with annoying gurgling sounds when the heat control is over to full-hot and the car is accelerating.
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