406512 Valve Guide Retainer Fits Ford New Holland Tractor 2N 8N 9N 40-6512One New Aftermarket Replacement Valve Guide Retainer Fits Ford New Holland Tractors This valve guide retainer secures the valve guide in the cylinder head on the 120 CID (2. 0L) 4 cylinder gas engine used in classic Fits Ford (Fits Ford New Holland) utility tractors. It is a precision engine component required during cylinder head rebuilds, keeping valve guides properly seated to maintain valve train alignment and compression. A complete engine