The John Deere RE38851 is a genuine OEM cylinder head gasket designed for a wide range of John Deere agricultural and industrial equipment. This critical engine component ensures a proper seal between the cylinder head and engine block, preventing leaks and maintaining optimal engine compression. It is compatible with numerous John Deere 40, 50, and 55 Series tractors, 6620, 7720, 8820 combines, 9940, 9950, 9960 cotton pickers, 5720, 5730, 5820, 5830 forage harvesters, 6466D/T industrial engines and power units, and 762A, 762B scrapers. This part supersedes RE20093.