The instructions on how to install spark plugs from ACDelco can be found on the website of the company. Precise information and instructions can be sought under the section spark plugs of the website.
0.035 inches for CR43TS or R43TS AC Delco spark plugs
check with your parts house to get the gap for your particular application.
ACDelco R45S conventional spark plugs for an original ignition system.
I have a 1996 Chevy astro w/ 4.3 L vortec... these plugs fit that motor.
.045 " is the correct gap.
If your're using ACDelco Platinum Spark Plugs the gap is .040".
Platinums are gapped at 0.60, and iridiums are typically gapped at 0.40... you shouldn't try to change the preset gaps.
I would use original equipment ACDelco Iridium spark plugs part number 41-103 for best results.
The original factory plugs were ACDelco plugs (I believe Iridium) and were top notch! I would highly recommend another set of ACDelco iridiums simply because they perform well, consistently, and are well proven. P# 41101
Depends on the spark plug you use. The ACDelco part number R43TS6 uses a .060" gap.
you will need some ratchet swivels or wobbles but more importantly some short (1/2" - 1&1/2") extension if you can get them. doesn't look like you can over insert them, plugs pulled out were ACDelco CR43TSM, I replaced them with CR43TS, noproblem, did not look like they could be over inserted. Haynes manual lists gap for plug as .035" you will need to gap plugs before installing if using the acdelco cr43ts plugs hints: A small mirror be helpful to get a good view of the plug holes as you stand at your front bumper and face the engine, the upper right of the six plugs will be very hard to reach because of the steer column; to make this easy get a second person and have one stand in front of the car to guide the fitting, and have the other person crouch by the front driver side wheel well and reach the plug with the ratchet fitting/extension (6" or so)