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roundman

plugs come in two sizes, 14 mm and 18 mm. they also come with straight threads and a little round crush gasket or tapered threads without any gasket. Fords use a tapered thread. the smaller ones are used on 5.0 motors while the bigger ones were used on 302 motors, so tell the guys you have a 5.0 motor to get the right plugs. the small ones use a 5/8" socket while the big ones use a 13/16" socket.

vfast

the plug you need is an autolite 25