It is closer to a half inch then a quarter inch. It is bigger than one third of an inch.
The gap is supposed to be between .035 and .038 inches. .038 will give you a little more "get up and go" in my experience.
5E 038, that sounds about right for the Flayderman's no. It's greatly dependent on condition and not given that what he has in there is probably as close of a estimate as your going to get.
0.044 (In thousandths of an inch) as specified by auto zone for my 1995 240SX SE (KA24DE)
in the book i have it says .033 to .038.............i would set them at .038 to .040 thousands............should be good.
Your answer is as follows: 38,000,000,000
.038, is this what you mean?