When running higher rpm, higher boost, and/or a more aggressive cam, valve springs need to be upgraded on your 4BT.  The Hamilton Cams 07-S-007 Heavy Duty Valve Springs allow higher boost pressures and rpm without valve float or unacceptable levels of reversion.  




  • 4BT Cummins Valve Springs
  • Chromoly Retainers and Locks

Hamilton Cams Heavy Duty Valve Springs (3.9L 4BT Cummins)

SKU: 07-S-007

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