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PacBrake strongly recommends installing heavy duty (60 psi) exhaust valve springs with their exhaust brake on 1988-1998 12 valve Dodge Cummins for optimum braking power. The factory exhaust valve springs are not rated to retain the pressure the PacBrake puts forth on the springs.
- The seat pressure on these springs is ~115lbs at the installed height of 1.950.
- At 400 lift, the spring pressure is ~192-195lbs.
- At 500 lift, the spring pressure is ~210lbs.
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