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In a cylinder block, the opening that the valve head rests in is called the valve A. stem. B. seat. C. guide. D. margin.
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In a cylinder block, the opening that the valve head rests in is called the valve A. stem. B. seat. C. guide. D. margin.

User DarKnight
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It depend's on the engine but out of the answer's provided it is B. seat. 
User Kerem Bekman
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