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I am looking at my owners manual for my 2003 Trailblazer Vortec 4.2L L6 (this is the inline 6, the option for a V6 is not available for the 6 cylinder). Per the owner's manual Spark Plug gap is .042 inches and the firing order is 1-5-3-6-2-4
1-6-5-4-3-2 number 1 is the front Cyl on drivers side. then it is #3 #5 Passenger side is #2 #4 #6 #1 on distributor cap is the front side of cap next to the hold down screw clockwise side of the screw. Firing order goes clockwise looking down on the distribuater.
you need the firing order?? it is 1, 6, 5, 4, 3, 2 clockwise. Number
one on cap is forward position, or 6 o'clock position, just left of the
hold down bolt.
looking from the top front.
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