What is proper spark plug gap?

[goser]

98 4.3 vin W... Sticker inside hood says 0.045, owners manual says 0.060. Which one is right?

[old_master]

A/C Delco spark plugs #41-932 gap is .060 for that engine. A small dab of anti seize on the threads helps with the next replacement. Don't forget the silicone dielectric in the plug wire boots.

[MT-2500]

At the time the info was printed both were right.
But over the years gap and plug no's have changed.

At the time of manf. in 1998 specs were 41-932 AC plugs at .045 gap.
Some where along the line they changed gap to .060.
My 2004 AC spark plug book also gives a plug no change to AC Delco 41-975 at .060

Always check the latest AC Delco spark plug book for proper plug and gap.

Another note on Platinum spark plugs is the good repair book says do not attempt to re gap them.
Check them and.
If they are not gaped or set right pitch them back and get a spark plug that is set right.

Also while not in the book and is the installers option I always like to center the platinum dot on the tip with the center of the electrode.
Which may take going threw 2 sets or more of plugs to get a set that is set just right.
MT