I agree with you. But This is part of the reason I'm questioning this. If the 41-162 is shorter then the 41-110. How will that affect things?? Would the plug last longer before it was oiled fouled?? Now I get between 12000 to 15000 miles on certain cylinders. I bet you can guess what cylinders are the problem ones. lol
I found this here https://www.2carpros.com/questions/correct-spark-plugs
Pulling up the spark plug product number by VIN, on dealer and GM parts sites gives me A.C. Delco 41-110, and a circle with a line through for availability. Pulling it up by make, model, 8th digit of VIN etc, gives AC Delco 41-162, which are quite a bit shorter. Which is correct?
I compared the two, the 110 is about 3/8 of an inch longer from the seat to the electrode.