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Hamilton Diesel 5.9L 12 Valve Cummins HD Springs & Billet Retainers/Keepers [HDP12VS-x]

Our Price: Starting at: $579.99

580 reward points

Model: HDP12VS-x
Shipping Weight: 12lbs
Manufactured by: Hamilton Cams

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Hamilton Diesel's 12 valve springs were designed to fix many of the problems in the 12v valvetrain. Factory and "60lb" springs do not have enough spring pressure to adequately control the valvetrain in all conditions. In fact at 1.4" they have exactly the same pressure as factory springs!.

Trucks running over 3400rpm with stock springs or 3800rpm with 60lb springs are experiencing valve float.


  • Beehive design to reduce valvetrain mass, increase initial acceleration of the valve, and to cancel spring harmonics.
  • Nitrided to prevent corrosion.
  • Made with only the best ovate wire available to handle cams with high lift.
  • Must be used with our 10° locks and ultra-light 4140 retainers.
  • These springs will easily handle cams with .650" lift.

Use our HD12vs-1 for street trucks that see occasional track use.

  • 155bs seat pressure
  • Will handle cams up to .650 lift
  • Must use our 4140 retainers and 10 degree locks
  • Best for street trucks or trucks that see some competition

Use our HD12VS-2 for trucks that spend lots of time over 5000rpm or have super aggressive cams. (select option below, adds $100)

  • 155bs seat pressure
  • Will handle cams up to .650 lift
  • Must use our 4140 retainers and 10 degree locks
  • Has extra stress relief processes to prolong longevity in high stress applications
  • Best for competition engines with high lift cams or high rpm.

Our -2 version has three extra shot peen and stress relieving processes for added peace of mind with your competition engine. Literally the best 12 valve spring on the market!

Our 10 degree chromoly retainers weigh in at 11.8 grams a piece, factory retainers weigh around 40 grams a piece and some Ti replacements on the market are almost 25 grams.

Seat Pressure vs Lift of Hamilton Diesel 12 Valve Springs VS "60LB" Valve Springs:

1.940"88 150155

$549.00 Gets you the HD12vs-1.

$649.00 Gets you the HD12vs-2 competition springs.

Picture shows comparison of 60LB Valve Springs & Retainers VS Hamilton Diesel Springs & Billet Retainers.

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