A more obvious change concerned the layout of the rocker arms that operated the valves.

Mama taught me well about tires, and many other things besides, but I knew nothing of rocker arms.

"Our paths would never have crossed if it weren't for a bent rocker arm."

The valves were operated by short rocker arms from an overhead camshaft.

Another disadvantage is the contact point between the cams and rocker arms.

This arrangement caused the outer exhaust valves to have a rather long rocker arm.

It is a single-cam, 12-valve design, with manually adjustable rocker arms.

His 44th place finish was due to a break in the rocker arm.

"He can listen to a car and say, 'You've got a loose rocker arm'."

It sounds like a good machine, a perfectly balanced rocker arm, something well-oiled and precise.