The 2004 Chevy Express 6.0 liter motor spark plug gap is .032. Most spark plugs will come pre-gapped from the spark plug manufacturer.
.060 of an inch
0.40
.060
.43 is the gap
.040 in
.060
Correct gap is .60
60.
0.060
Factory specs. 0.040
The 2005 Chevy Trailblazer has Coil-On-Plug ignition coils so there are 6 "coil packs". Each one is mounted on top of the spark plug.