I am thinking it's .040 but it's been so long I can't say for sure.
.
.035
the spark plug gap for 2006 Pontiac g6 V6 is .060
Spark plug gap is .060
The Spark Plug Gap.060 (In thousandths of an inch)
wiring diagram for a 1995 Pontiac fire bird 3.4 spark plug wiring diagram?
Spark plug wires, spark plug boot, or coil on plug.
.035
.045
035
0.045
.059