.045 " is the correct gap.
I have a 1996 Chevy astro w/ 4.3 L vortec... these plugs fit that motor.
0.035 inches for CR43TS or R43TS AC Delco spark plugs
AC Delco Iridiums
AC/Delco
a/c delco is the best
6 AC Delco 41-940 for the 3400 & 6 AC Delco 41-921 for the 3800.....
From what I've been told from my AC DELCO REP they are NGK plugs
Champion Filters (not connected with Champion Spark Plugs)
There in the heads on the motor
ac delco copper Use the factory recommended plugs. AC delco 41906.
R44T
yes