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2003
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Impala LS
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Spark Plugs
Spark Plugs
SPARK PLUG TYPE
Application
Spark Plug Type
Spark Plug No.
3.1L & 3.4L
AC
41-940
3.8L
AC
41-921
SPARK PLUG SPECIFICATIONS
Application
Gap - In. (mm)
Torque - Ft. Lbs. (N.m)
All Engines
.060 (1.52)
11 (15)