It would be best to discuss this with Pertronix.
A 2009 Chevrolet Silverado with the 5.3 engine requires a .040" spark plug gap.
For a 1970 OMC 6HP engine, the recommended spark plug is the Champion J6C or an equivalent plug
.060
2004 Chevrolet Aveo 1.6L MFI DOHC 4cylThe Spark Plug Gap.044 (In thousandths of an inch)
.045 plug gap.
The spark plug gap for a Chevrolet Tahoe 5.7 350 Vortec should be set at .060 inches. This spark plug will be purchased preset from any auto parts store.
the spark gap .060
18436572
0.035 in.
Change_spark_plug_on_chevrolet_avalanche_2002
.060
spark plug gap is 1.04 mm or .40 inch