40-3020903 Head gasket, Hercules model G3400 engines. Superseded numbers were 40-3020902 and 287218 Hercules It breaks at the hole

It breaks at the hole and that tells us everything

Please read the following:

These engines were used in different application including Amida arrow boards

even though 757-18460 is still a good number

The hook end of this spring is longer then the other spring

40-3020903 Head gasket, Hercules model G3400 engines. Superseded numbers were 40-3020902 and 287218 Hercules It breaks at the hole40 3020903 Head gasket used on the 3400 series 6 cylinder Hercules engines, both Diesel and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