A-R26124-AI Valve, Intake (Std)One New Aftermarket Replacement Intake Valve (Standard) for John Deere Tractors This standard size aftermarket intake valve fits the cylinder head of John Deere 3010 and 4010 tractors equipped with the 254D and 381D diesel engines. The valve seats at a 45 degree angle and restores proper compression and sealing during engine overhaul or valve job work. Important: This valve fits engines with serial numbers below the cutoffs listed below verify your