The rocker arm employs the use of a fulcrum or pivot to increase the cam lift by a given ratio. That increase in lift is the result of moving the pushrod pivot point closer to the fulcrum. That ...

In the valvetrain of your typical pushrod engine, the rocker arm is a critical component that also is an excellent tuning device. To properly tune with rocker arms, though, you need to understand how ...

The #3 cylinder exhaust valve pushrod broke due to a valve stuck in the closed position. No marks were seen on the top of the piston through a borescope. The lifter came apart as a result of the ...