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Answer :
Final answer:
Excessive cylinder head or block deck resurfacing on a pushrod engine can change the geometry between the valve stem tip and rocker arm, making Technician A correct.
Explanation:
**Option A: Technician A is correct.**
Excessive cylinder head or block deck resurfacing on a pushrod engine can indeed change the geometry between the valve stem tip and rocker arm. This is because when the cylinder head or block deck is resurfaced excessively, it can alter the height of the valve seats in relation to the pushrods, rockers, and valve stems. This, in turn, affects the valvetrain geometry.
The valvetrain geometry is critical for proper valve operation, ensuring that the rocker arms contact the valve stems correctly. Any changes to this geometry, including those caused by excessive resurfacing, can lead to issues like improper valve clearance, poor valve seating, and even engine performance problems. Therefore, it's essential to maintain the correct valvetrain geometry during any engine machining or cylinder head work to ensure proper engine operation.
Technician B's statement about excessive grinding of the valve face and seat is also relevant but not in the context of valvetrain geometry. It pertains more to the sealing and performance of the valves themselves.
Learn more about Pushrod engine geometry here:
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