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Why is there a hole in the driver's side cylinder head towards the front of the car? Did they just want to save material.

See attached picture with the intake manifold removed.

99 ML430

Thank you.
 

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Why is there a hole in the driver's side cylinder head towards the front of the car? Did they just want to save material.

See attached picture with the intake manifold removed.

99 ML430

Thank you.
Its there to dissipate heat. If it was solid it would retain more heat.
 
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