There is a white sticker under hood with engine size and other info on it it should say on that its it normally located on the air filter cover
.042
Remove the spark plug wires from each spark plug. Turn the spark plug out with a 5/8 deep well socket. Reverse the process to install the new spark plugs.
what is the spark plug gap for 2005 gmc envoy 4.2l v6
The 1996 GMC Sierra six-cylinder spark plug gap, is .009. Most spark plugs are pre-gapped by the spark plug manufacturer.
.096 is the spark plug gap
The recommended spark plug gap is .060"
Spark plug gap should be .060
The proper spark plug gap for a 1992 GMC Suburban 5.7 L is .035 thousandths of an inch. Many spark plug gaps are pre-set.
SPARK PLUG GAP2006 GMC Truck Sierra 1500 2WD 5.3L SFI HO 8cylThe Spark Plug Gap.040 (In thousandths of an inch)
The gap for spark plugs in a 96 GMC sierra is .60
spark plug gap for 1994 gmc jimmy