Mark V & VI. Brass plugs. 1 5/8" block plugs.
6.0L / 366 OHV V8 16V "B,P" GM 3.938" Bore 66-98
GM, CHEVROLET
7.4L / 454 OHV V8 16V Chev. Mark V Big Block 4.250" Bore 91-97
GM
7.4L / 454 OHV V8 16V Chev. Mark VI Big Block 4.250" Bore 96-00
GM
7.4L / 454 OHV V8 16V Chev. 4.250" Bore 71-00
GM, CHEVROLET
7.4L / 454 OHV V8 16V Chev. Big Block 4.250" Bore
GM
8.1L / 496 OHV V8 16V Chev. Mark V Big Block Stroker 4.250" Bore 91-97
GM
GM366T-CH | 6.0L / 366 OHV V8 16V "B,P" GM 3.938" Bore 66-98
BUICK,
CADILLAC,
CHEVROLET,
GEO,
GMC,
OLDSMOBILE,
PONTIAC
GM454T-CH | 7.4L / 454 OHV V8 16V Chev. 4.250" Bore 71-00
CHEVROLET,
GMC