Pacbrake C14010 Valve Springs '88-'98 12 Valve 5.9 Cummins This pressure is regulated by

This pressure is regulated by the overflow valve that lets the fuel return back to the tank once the proper pressure is reached

Kit part # ISK1

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Pacbrake C14010 Valve Springs '88-'98 12 Valve 5.9 Cummins This pressure is regulated byPacbrake upgrade 60 psi valve springs, sold in a set of 6. One set is required to upgrade exhaust valve springs to run an exhaust brake. **2 sets needed to do all 12 valve springs if you want to run 4000 rpm. "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