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Small Cylinder Head Plug The right hand (passenger side) cylinder head on all 292/312 engines have a cupped plug pressed into the rear of the head . The 1949-1959 FORD CAR PARTS AND ACCESSORIES TEXT CATALOG list it as P/N EAN 6052-A- cup type-.914"/.920"O.D.-.32"overall length. It has not been available for several years from FoMoCo dealers. I have received several calls recently about the availability of this plug. It can be obtained from most parts dealers such as NAPA. It is made by CLEVITE Engine Parts, ,Collierville TN P/N 219-3077.