Steel plugs.
2.3L / 140 OHV L4 8V "R,S,X" HSC 3.680" Bore 84-94
FORD
2.5L / 153 OHV L4 8V "D" HSC 3.680" Bore 86-91
FORD
FO140CC | 2.3L / 140 OHV L4 8V "R,S,X" HSC 3.680" Bore 84-94
FORD,
MERCURY
FO153C | 2.5L / 153 OHV L4 8V "D" HSC 3.680" Bore 86-91
FORD,
MERCURY