Should tell you on the emissions sticker under the hood
2004 Chevrolet Aveo 1.6L MFI DOHC 4cylThe Spark Plug Gap.044 (In thousandths of an inch)
A 2004 Chevrolet Trailblazer that has a 4.2 liter engine will have a spark plug gap of .044 inches. The best spark plugs for this vehicle are iridium spark plugs.
The spark plug gap for a 2004 Chevrolet Suburban should be set at .040 inches. The new spark plugs are pre-gapped and do not need adjusting.
2004 Chevrolet Truck Silverado 1500 2WD 5.3L SFI 8cylThe Spark Plug Gap.040 (In thousandths of an inch)
A 2009 Chevrolet Silverado with the 5.3 engine requires a .040" spark plug gap.
.045 plug gap.
Listed in owner's manual and under the hood on a placard.
the spark gap .060
.060
The recommended spark plug gap is .044"
The spark plug gap in your 1999 Chevrolet suburban is dependent upon the type of engine. The standard engine spark plug gap is .011.
spark plug gap is 1.04 mm or .40 inch