PK1B Enginetech Brass Expansion Freeze Core Plug Set for Small Block Chevrolet. 3.3L / 200 OHV V6 12V "M" Chev. 3.500" Bore 78-79 78-79 Brass plugs. 3.8L / 229 OHV V6 12V "9,K" Chev. 3.736" Bore 80-84 80-84 Brass plugs.
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