Engine VIN code 3. Except Riviera. 2nd design with 5.25" deep oil pan.
3.8L / 231 OHV V6 12V "2,A" Buick 231 3.800" Bore 78-84
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
GM231CA-BU | 3.8L / 231 OHV V6 12V Buick 231 3.800" Bore 75-88
BUICK,
OLDSMOBILE,
PONTIAC,
CHEVROLET
GM231CBA-BU | 3.8L / 231 OHV V6 12V Buick 231 Turbo 3.800" Bore 78-89
PONTIAC,
BUICK
GM231TA-BU | 3.8L / 231 OHV V6 12V "2,A" Buick 231 3.800" Bore 78-84
CHEVROLET,
GMC