🔍 Key Concepts

• Intake valve guides control the alignment and movement of the intake valve in the cylinder head • How excessive clearance between valve stem and guide affects air flow, oil control, and valve motion • Relationship between valve guides and oil consumption, valve lash, and engine efficiency

💭 Think About

• Think about what happens if the valve can wobble or move side-to-side in the guide—what can leak past that space? • Which of the answer choices would most likely be a negative consequence of wear rather than an improvement in performance or efficiency? • Ask yourself: does worn guidance of the valve make clearances tighter or looser, and what does that typically allow into the intake port and cylinder?

✅ Before You Answer

• Eliminate any option that describes a clear performance improvement (more efficient, lower fuel use) caused by a worn part • Consider whether worn guides would cause more clearance or less, and how that affects valve lash • Focus on which symptom is commonly associated with oil getting past guides into the intake rather than with fuel system changes