I finally got around to flowtesting the modded Spiral when connected to the loop. The amazing fantastic plastic bucket we all so love to hate

15 seconds to fill to the one gallon line, repeated twelve times in a row (hey, it's only 15 seconds so why not

)
240gph.
The Equalizer block? 14 seconds, to even my amazement for how confined the passageways are. 250gph
My earlier block, the large cone, was chugging along at 360gph as a flowrate comparison for my system.
And I also lapped the IHS. Light lapping on the left pic and complete lapping on the right pic. Can you see the inital unevenness?