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2. Rocker cover - Wikipedia

   en.wikipedia.org/wiki/Rocker_cover

   A rocker cover, (UK), or valve cover (elsewhere) is a cover that encloses the rocker arm in an internal combustion engine, bolting with a gasket seal to the engine head. Engines with more than one head (such as a V8 ) will have multiple rocker covers.

3. Head gasket - Wikipedia

   en.wikipedia.org/wiki/Head_gasket

   Asbestos gaskets are increasingly rare due to health concerns. [4] Elastomeric: Uses a steel core plate with molded in place silicone rubber beads to seal oil and coolant passages. The bores are sealed by rolled steel fire rings in a more conventional manner. This type of gasket was used in the Rover K-series engine.

4. Gasket - Wikipedia

   en.wikipedia.org/wiki/Gasket

   Gaskets allow for "less-than-perfect" mating surfaces on machine parts where they can fill irregularities. Gaskets are commonly produced by cutting from sheet materials. Given the potential cost and safety implications of faulty or leaking gaskets, it is critical that the correct gasket material is selected to fit the needs of the application. [2]

5. Rocker arm - Wikipedia

   en.wikipedia.org/wiki/Rocker_arm

   The ratio is determined by the ratio of the distances from the rocker arm's pivot point to the point where it touches the valve and the point where it touches the pushrod/camshaft. A rocker ratio greater than one essentially increases the camshaft's lift. Current automotive design favors rocker arm ratios of about 1.5:1 to 1.8:1.

6. Hermetic seal - Wikipedia

   en.wikipedia.org/wiki/Hermetic_seal

   A hermetic seal is any type of sealing that makes a given object airtight (preventing the passage of air, oxygen, or other gases).The term originally applied to airtight glass containers but, as technology advanced, it applied to a larger category of materials, including metals, rubber, and plastics.

7. Al Roker Shares Wisdom His Father Gave Him That ... - AOL

   www.aol.com/al-roker-shares-wisdom-father...

   Al Roker is reflecting on his decades-long health and wellness journey. The beloved Today weatherman, 70, is leading the charge for the morning show's new Start Today fitness app, which launches ...