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Product Description

Peak 4BT Heavy Duty Valve Spring Kit

Application: 4BT Cummins

8 x 60LBS Springs 
It is recommended installing heavy duty (60 psi) exhaust valve springs with an exhaust brake on a 4BT Cummins for optimum braking power. The factory exhaust valve springs are not rated to retain the pressure the exhaust brake 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.