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What kind of wrench should be used to tighten engine components such as manifolds and cylinder heads?

  1. box

  2. crescent

  3. pipe

  4. torque

The correct answer is: torque

A torque wrench should be used to tighten engine components such as manifolds and cylinder heads. This is because torque wrenches provide precision in tightening bolts to a specific torque, which is critical in engine assembly. Options A (box) and B (crescent) are general purpose wrenches and may not allow for precise and consistent tightening. Option C (pipe) is not a specific type of wrench and may not be suitable for this specific task. Therefore, the best option is D (torque wrench).