Black box, Offering a new set of 8 AC Delco Green stripe spark plugs, part # C42-1, GM #5612140, Group 2.270. Old part numbers: 5612009, 1550440. Plugs may have minor factory or storage imperfections, blemishes, dings, etc. If you are looking for show quality, this may not be the part for you. Plugs come with boxes and spin on gaskets. According to factory manuals/catalogs this plug was installed in vehicles for continuous use of high speed or in trucks for heavy duty applications.

POSSIBLE FITMENT:

1958 - 1959 CORVETTE continuous high speed

1958 Chevy Passenger 3 2 barrel with high lift cam 1st design

1956 -1964 Buick all required for high speed or high power equipment

Chevy Trucks

1949 - 1955 1 1/2 ton truck 1st series

1949 - 1955 2 ton truck

1963 4 wheel drive 261 1st series

Medium Duty Trucks

1955 series 6

1956 - 1958 all

1959 all except 348

1960 - 1962 series 60 (Except 348)

1963 - 1964 with 327

Standard normal service or continuous high speed

Chevy/GMC heavy duty trucks

1956 B 19-99-W19-W99

1957 all

1958 - 1959 50-60-960-80-980-100-9100-W100-W9100

1960 - 1962 all with 261 6 Cyl

1960 - 1962 69-960W with 283, 327 V8

1963 all with 327 V8

GMC trucks 40 thru LW70 with 305C, 351, 401, 478, 702 engine

May fit other vehicles.