Cancel the order for the Heidts valve. It doesn't work and adds 8 more potential leaks. The flow control valve you pictured earlier is the right answer.
You want to limit volume, not pressure. The adjustable valve just bleeds pressure into the return hose and by the time you turn it down enough, you will have little assist at slow speeds.
The MII rack wants about 2 gpm and most GM pumps are 3 or more. The flow valves are just a fixed orifice of differing sizes. The 2 gpm has a smaller hole than the 3gpm.
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Donny
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