I'm aware of that Bill, but modifications to the block notwithstanding, a 3/8" central inlet block with be better than a 1/2" inlet block.
Of course, if the block has removable barbs and is 1/2" and has a wide-open 1/2" barb, then rip out the low-restriction barb and go buy a 1/2" barb with an 8mm ID and stick it on. Then basically we have what you're describing Bill (as you've demonstrated), and agreed, that is the better solution.
Problem is many people don't like modifying their blocks so I was answering from that perspective only.
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