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Finally, we hooked up the new power-steering system. GM pumps of this vintage are designed to run at 1,000-1,200 psi, while the power rack works at 700-800 psi. Heidt's came up with this adjustable power-steering valve. Using a simple needle and bleed-off port, fluid is bled from the pressure line to the return line, so there are no pressure-buildup problems. The steering system can now be adjusted from full-power to almost-full-manual, or anywhere in between.