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Hamilton Cams 24 Valve 103 lb Springs + Extreme Duty Pushrods + Tool Steel Retainers + FREE  Injector Nozzle Removal Tool and 24V Valve Spring Tool for Dodge Cummins 5.9L/6.7L




  • Must have 103lb springs if you are over 35 PSI (boost or drive pressure) and 3,800 RPM
  • If you are over 750hp, the cylinder pressures acting on the valve can bend your OEM pushrods before the valve opens. This can retard cam timing and reduce valve liftThese pushrods are a 3 piece design that features 12mm diameter .120″ wall, which is much thicker than the OEM 3/8 or other performance shops 7/16″ Diameter.
  • Hamilton Cams Part Number: 07-S-003 (Springs) and Hamilton Cams Part Number: 07-P-004 (Pushrods)
  • Hamilton retainers now included with all orders.
  • Includes 3 FREE TOOLS by Ohio Diesel Parts: 24V Valve Spring Compressor Tool, Engine Barring Tool and Injector Nozzle Removal Tool
  • Fit 24V Cummins 5.9L/6.7L
  • Made in U.S.A




As cylinder pressures, springs pressure and rpm increase, the stress on your factory pushrods increases far beyond the level of stress your factory pushrods were designed for. If you are above 750 HP,  you need to upgrade to the extreme duty pushrods. These pushrods are a 3 piece design that features 12mm diameter .120″ wall, which is much thicker than the OEM 3/8 or other performance shops 7/16″ Diameter.




Stock springs have 78-82lbs of pressure seat pressure on average at 1.380″. If you are over 35 PSI (boost or drive pressure) and 3,800 RPM, stock springs do not fully control the valve train. This allows a few negative things to happen. First, valve float, which can cause serious damage to the valve train. Second, intake and exhaust valves can be blown open by boost and exhaust drive pressure which allows reversion. Reversion can hurt your power potential by allowing exhaust gasses to enter the cylinder on the intake stroke. Inert gasses in the exhaust, when re-introduced into the cylinder shield the fuel particles from oxygen in the cylinder. This does a few things that negatively affect power. It increases the time delay from start of injection to start of combustion, it decreases the maximum pressure and maximum temperature reached in the cylinder and it increases the total time needed to completely burn the available fuel. Correct valve spring pressure is a very important piece of power production. Triple Shot peened and stress relieved.

We recently slightly lowered the pressure on our springs from 110lb to 103lb. Nose pressure has been lowered from 220lb to 180lb. Watch out for other companies that have nose pressures over 250lb. Your cam will have a shorter life with 250lbx2 (500lb) versus 180lbx2 (360lb) over the nose of the cam. Don’t just ask what seat pressure is when you are shopping for springs, ask what the pressure is on the nose (1.031″ with OEM cams or .958″ with the 188-220)


If you are running over 4,500 rpm with a large cam, we suggest going with our 103lb springs with different heat treat and shot peen, for better longevity in extreme applications, as well as our light-weight 4130 or titanium retainers.


Warning: Warning: not all 24valve springs are created equal…. recently we have started seeing other companies market products that are called 110lb 24 valve springs, when in reality they have 117-119lb of seat pressure and almost 250lb nose pressure at .320 lobe lift. Also, they are designed as an entry level spring for a dodge neon, but are re-boxed and sold to the diesel crowd. This spring can cause major lobe wear to anything over a stock lift cam. ALL of our cams have more than stock lift.


For comparison, our 103lb springs have 102-104lb seat pressure and 180lb nose pressure with the 188-220. By running anything other than our 103lb 24v springs with our cam, you nullify the warranty we offer. If you run a cam with more than .320″ lobe lift and anything other than the 103lb spring you run the chance of experiencing coil bind before maximum valve lift is achieved.




  • 24V Valve Spring Compressor Tool: Tapered bore holes stops valve keepers from falling through the tool and reduces the chance of dropping a valve keeper in your engine.Designed to easily change valve springs, seals or retainers on Cummins 24V 5.9L and 6.7L. CNC-machined thick heavy aluminum. Quickly compress all four springs in the cylinder in one step for easy replacement.
  • Barring Tool: Save-time turning over the engine or turning the crank to perform manual valve lash adjustment. Used to slowly rotate the engine by hand so you can line up the timing marks. Easy-to-Use: Insert tool into the flywheel housing until it engages the ring gear, attach ½” square drive racket or breaker bar to turn.
  • Injector Nozzle Removal Tool: Simply clamp tool in vice (DO NOT OVER-TIGHTEN). Custom fit openings stops injectors from spinning while removing the nozzle preventing damage to injectors by placing them directly in a vice. 2-in1 Tool fits both 5.9L and 6.7L Cummins.
  • Made in Ohio, U.S.A



Manufactured RIGHT HERE in the U.S.A.

Our kit will get the job done!



Twenty-four (24) Hamilton Cams 103 lb Springs

Twenty-four (24) Tool Steel Hamilton Retainers

Twelve (12) Hamilton Cams Heavy Duty Pushrods for Intake

One (1) Compressor Plate ,CNC-Machined Bridge Plate with Two (2) Hex-Bolts, and One (1) Carriage Bolt, Washer and Flange Nut

One (1) Injector Nozzle Removal Tool

One (1) Engine Barring Tool 



Please call or text (216) 408-6455 any day or time. Someone is always available to answer questions.


Hamilton Cams 24 Valve 103 lb Springs+Extreme Duty Pushrods+Retainers

    • Must have 103lb springs if you are over 35 PSI (boost or drive pressure) and 3,800 RPM
    • 103lb Spring Pressure and 180lb Nose Pressure and Extreme Duty steel pushrods designed for over 750 HP
    • Hamilton Cams Part Number: 07-S-003 (Springs) and  Hamilton Cams Part Number: 07-P-004 (Pushrods)
    • Includes Hamilton retainers
    • Includes FREE Ohio Diesel Parts Valve Spring Compressor Tool
    • Fit 24V Cummins 5.9L/6.7L through years 1998.5-2017
    • Made in U.S.A
  • The product sold above if used for modification of a vehicle in any way or as stated above for any vehicle is not associated with the vehicle manufacturer. The seller is not a certified mechanic and assumes no responsibility for damage, liability, or injury that may result to you, your vehicle, and/or others.

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