What makes you think it's a push rod design?
Hydraulic Lash Adjusters
The Revolution® Max 1250 engine features roller-finger valve actuation with hydraulic lash adjusters.
This design ensures that the valves and valve actuators (“fingers”) are in constant contact as engine heat changes.
The hydraulic lash adjusters make the valve train maintenance-free, saving the owner time and cost – there is no mechanical adjuster.
This design realizes a reduction in undesirable valve train noise, especially on cold starts. This design maintains consistent pressure on the valve stem, which facilitates more-aggressive camshaft profiles which can boost performance.
Variable Valve Timing (VVT)
The Revolution Max 1250 engine is equipped with computer-controlled Variable Valve Timing (VVT) on both the intake and exhaust camshafts.
Through computer control, VVT advances or retards exhaust and intake camshaft timing independently through a potential range of 40 degrees of crankshaft rotation.
VVT broadens the overall powerband and improves torque management and efficiency compared to the same engine with fixed valve timing. This allows the same engine to provide both low-end grunt for acceleration off the line as well as the thrill of high-RPM horsepower.
VVT may improve fuel efficiency and increase range from each tank of fuel.
The timing phaser is located between the cam drive sprocket and the camshaft, and uses a solenoid plunger to control ported hydraulics that change the cam timing.
When the engine is shut down, VVT sets intake cams to full retard and exhaust cams to full advance to reduce compression for easier starting.
Camshaft position pick-ups are located in the valve covers.