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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.
FEATURES:
- 4BT Cummins Valve Springs
- Chromoly Retainers and Locks
Hamilton Cams Heavy Duty Valve Springs (3.9L 4BT Cummins)
SKU: 07-S-007
$299.00Price