:thumbsup: Please post up your results when tested.
Looks like someone already makes them I do like the tapered ID for flow. They also sell the washer type in a kit with 3 different.
http://www.ebay.com/itm/Allstar-Performance-1-3-4-in-Aluminum-Radiator-Hose-Restrictor-P-N-30242-/142084005752?hash=item2114dddf78:g:n8YAAOSwgZ1Xrod5&vxp=mtr