Denso Gap

The denso plug has a U shape electrode.


If you check the gap with a flat feeler guage and not in the center of the U you get a tight reading,its closer to what the book calls for when a wire guage is used in the center of the U electrode.

The service manual calls for 0.043 gap I need a wire guage so to accurately gap the plugs, as I don't trust being gaped at the factory, as the plug is used in other applications.

Some may say it doesn't make that much difference but its alot of work to change them out so just as well do it right!