A-A41783-AI Guide, ValveOne New Aftermarket Replacement Valve Guide Fits Case Tractors and Construction Equipment This aftermarket replacement valve guide fits in the cylinder head of Fits Case engines, centering and supporting the intake and exhaust valve stems to ensure proper valve sealing, consistent airflow, and reliable oil control. Worn or damaged valve guides can cause excessive oil consumption, blue exhaust smoke, and loss of engine power making timely replacement