40-3020903 Head gasket used on the 3400 series 6 cylinder Hercules engines, both Diesel and Gas types. Old part number will be listed as 40-3020902 and 287218.
There maybe some variation in appearance depending on OEM manufacturer.
This will be item number 16 in the Hercules drawing
NSN 5330-01-389-0704, NSN 5330-00-133-0811
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