valve rocker

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Noun1.valve rocker - a lever pivoted at the centervalve rocker - a lever pivoted at the center; used especially to push a valve down in an internal-combustion engine
lever - a rigid bar pivoted about a fulcrum
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Additional upgrades include a "no adjust" overhead valve rocker system designed for a minimum of 150,000 miles without adjustment, a completely redesigned piston which increases power and fuel efficiency, reduced noise, and cleaner operation with reduced smoke and emissions.
The Newton plant will soon be producing its 2 millionth composite engine valve rocker arm cover for the Ford 3-liter V-6 engine, since launching the program in 1990.
The resin matrix of this new material is able to withstand temperatures 20 percent higher than composites new being used to produce engine valve rocker arm covers.