Brass plugs.
6.9L / 420 OHV V8 16V "1" Diesel 4.000" Bore 83-87
FORD
6.9L / 420 OHV V8 Diesel 4.000" Bore 80-88
INTERNATIONAL
7.3L / 445 OHV V8 16V "F" Turbo DI Diesel 4.110" Bore 94-03
FORD
FO420T/IH | 6.9L / 420 OHV V8 16V "1" Diesel 4.000" Bore 83-87
FORD
FO445TA/IH | 7.3L / 445 OHV V8 16V "F" Turbo DI Diesel 4.110" Bore 94-03
FORD
IH420T | 6.9L / 420 OHV V8 Diesel 4.000" Bore 80-88
INTERNATIONAL