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The top row shows innards of the pressure regulator valvetrain, which controls line pressure (from left: pressure-regulator valve, spring, pressure-regulator isolator, reverse-boost valve, and reverse-boost valve sleeve)...
Red Dog 6 - Technical Article - Chevy High Performance Magazine

The top row shows innards of the pressure regulator valvetrain, which controls line pressure (from left: pressure-regulator valve, spring, pressure-regulator isolator, reverse-boost valve, and reverse-boost valve sleeve)...  View Related Article