Brass plugs. Block plugs are 1.507" diameter.
3.0L / 181 OHV V6 12V "E,L" Buick 3.800" Bore 82-88
GM
3.2L / 196 OHV V6 12V "C" Buick 3.500" Bore 78-79
GM
3.8L / 231 OHV V6 12V "1,4" Buick 3800 S/C 96.50mm Bore 91-07
GM
3.8L / 231 OHV V6 12V "2,A" Buick 231 3.800" Bore 78-84
GM, CHEVROLET
3.8L / 231 OHV V6 12V "2,C,K,L" Buick 3800 96.50mm Bore 88-09
GM
3.8L / 231 OHV V6 12V "L" Buick 3800 96.50mm Bore 92-95
GM, CHEVROLET
3.8L / 231 OHV V6 12V Buick 231 3.800" Bore 75-88
GM
3.8L / 231 OHV V6 12V Buick 231 Turbo 3.800" Bore 78-89
GM
4.1L / 252 OHV V6 12V "4" Buick 3.965" Bore 80-84
GM
GM181C-BU | 3.0L / 181 OHV V6 12V "E,L" Buick 3.800" Bore 82-88
BUICK,
OLDSMOBILE,
PONTIAC
GM196C-BU | 3.2L / 196 OHV V6 12V "C" Buick 3.500" Bore 78-79
BUICK,
CHEVROLET
GM231CA-BU | 3.8L / 231 OHV V6 12V Buick 231 3.800" Bore 75-88
BUICK,
OLDSMOBILE,
PONTIAC,
CHEVROLET
GM231CB-BU | 3.8L / 231 OHV V6 12V "2,C,K,L" Buick 3800 96.50mm Bore 88-09
BUICK,
PONTIAC,
CHEVROLET,
OLDSMOBILE
GM231CBA-BU | 3.8L / 231 OHV V6 12V Buick 231 Turbo 3.800" Bore 78-89
PONTIAC,
BUICK
GM231CC-BU | 3.8L / 231 OHV V6 12V "1,4" Buick 3800 S/C 96.50mm Bore 91-07
PONTIAC,
BUICK,
CHEVROLET,
OLDSMOBILE
GM231TA-BU | 3.8L / 231 OHV V6 12V "2,A" Buick 231 3.800" Bore 78-84
CHEVROLET,
GMC
GM231TB-BU | 3.8L / 231 OHV V6 12V "L" Buick 3800 96.50mm Bore 92-95
CHEVROLET,
OLDSMOBILE,
PONTIAC
GM252C-BU | 4.1L / 252 OHV V6 12V "4" Buick 3.965" Bore 80-84
CADILLAC,
BUICK,
OLDSMOBILE,
PONTIAC
