Why Choose Manton Diesel Valvetrain Components?
A diesel engine’s valvetrain has to do more than survive high boost pressure. Every component must transfer motion accurately while carrying repeated loads through the tappet, pushrod, rocker arm, valve bridge, and valve spring. If one part deflects, wears, or loses proper lubrication, upgrading the parts around it may not solve the problem.
Manton develops diesel valvetrain components with that complete load path in mind. We offer application-specific upgrades for Cummins, Duramax, and Power Stroke engines, along with custom pushrods for combinations that no longer fit a factory-length solution. The reason to choose Manton is straightforward: we help you build a valvetrain whose parts work together for your engine’s actual demands.
Pushrods Built for the Load
A pushrod may appear simple, but its stiffness affects how much of the camshaft’s motion reaches the valve. Under higher spring pressures and more aggressive cam profiles, an undersized pushrod can deflect, reducing effective valve lift and adding unwanted motion to the system.
Manton offers diesel pushrods with different diameters, wall thicknesses, materials, and tip configurations. Our three-piece designs allow the tube to be selected for structural strength while the tips are selected for the bearing surfaces and oiling needs at each end. When the engine has been modified, we can also build pushrods to the required length rather than assuming the factory dimension is still correct.
That flexibility matters because a stronger pushrod is only useful if it fits the available space, mates correctly with the tappet and rocker arm, and maintains proper rocker geometry.
Rocker Arms That Deliver Valve Motion
The rocker arm must remain stiff enough to transfer motion accurately without adding unnecessary mass for the valve spring to control. It also depends on its shaft or trunnion, adjuster, bearing surfaces, and oil supply.
Manton diesel rocker-arm systems address those parts together. Depending on the application, our systems use steel rocker arms, tool-steel adjusting screws, upgraded shafts or trunnions, and roller tips. For example, our Duramax rocker-arm system pairs roller rockers with tool-steel adjusters, corrected-oiling shafts, and billet valve bridges.
Rather than treating the rocker body as the entire upgrade, we consider the assembly that supports it and the components it drives.
Valve Bridges Made for Demanding Applications
On engines that use valve bridges, the bridge carries rocker-arm force to two valves. Its strength and contact surface are important to both valve motion and wear.
Manton’s billet steel diesel valve bridges are CNC machined, heat-treated, and finish ground at the rocker contact surface. These processes are intended to provide a durable component with a consistent surface where the rocker arm applies its load.
Valve Springs Selected for Control
A diesel valve spring must keep the valve seated against the forces present in its application and maintain control as engine speed and valve lift increase. More spring pressure is not automatically better: too little can allow instability, while unnecessary pressure adds load to the rest of the valvetrain.
Manton offers diesel valve-spring upgrades, including conical-spring kits for applicable engines. Conical geometry can reduce mass toward the moving end of the spring and help manage spring surge. Our spring kits pair the springs with compatible retainers and locks where specified.
The right choice depends on the camshaft, lift, boost and exhaust pressures, installed height, RPM range, and intended use. We look at those requirements alongside the strength of the pushrods and rocker system—not as an isolated spring specification.
One Valvetrain, One Set of Goals
A high-boost work truck, a street-driven performance diesel, and a competition engine do not need identical parts. They differ in spring force, camshaft demands, operating speed, duty cycle, and maintenance expectations.
Manton gives builders a way to select upgrades around those differences. You may need a stronger pushrod while retaining the factory rocker system, or you may need a coordinated package of pushrods, rockers, bridges, and springs. The best answer depends on the engine—not on buying the largest version of every component.
If you are planning a diesel valvetrain upgrade, explore Manton’s diesel products or contact our team. Tell us about your engine, camshaft, boost level, intended RPM, and use. We can help you identify which components need to change and how to make them work together.
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