Brass plugs.
6.6L / 400 OHV V8 16V Chev. Small Block 4.125" Bore 70-80
GM
6.6L / 400 OHV V8 16V Chev. 4.125" Bore 70-76
GM
6.6L / 400 OHV V8 16V Chev. 4.125" Bore 70-80
GM, CHEVROLET
GM400C-CH | 6.6L / 400 OHV V8 16V Chev. 4.125" Bore 70-76
CHEVROLET,
PONTIAC,
OLDSMOBILE
GM400T-CH | 6.6L / 400 OHV V8 16V Chev. 4.125" Bore 70-80
CHEVROLET,
GMC
