🔍 Key Concepts

• Valve bridge operation when one rocker arm actuates two valves • How mechanical valve lash adjustment is usually shown in a drawing (locknut and screw on the rocker arm) • Typical appearance of replaceable valve seats in a cylinder head cross‑section

💭 Think About

• Look closely at the rocker arm and the tops of the two exhaust valves: is there a common piece linking the two valve stems together? • Do you see any component on the rocker arm or valve train that could be used to adjust clearance between the rocker and valve stem? • In the head material around each valve, does the drawing show a separate ring or insert that would indicate a pressed‑in valve seat?

✅ Before You Answer

• Verify whether a single rocker arm is in contact with a valve bridge spanning both exhaust valves. • Check for a locknut and adjusting screw or similar hardware that would allow mechanical lash adjustment. • Confirm if there is a distinct valve seat insert drawn as a separate piece from the cylinder head casting.