Update #2
I got the plugs and wires swapped.
Somebody said he was able to give them another last squeeze turn and he called that good, without using a torque wrench, but I just got the same turning feel clockwise until it hit the wall, no extra squeeze possible--I didn't try really hard though in case I broke something. So the torque wrench didn't get to play, the plugs were as far as they would go.
Any comments on that? Thanks.
The old OEM plug is an ACDelco branded NGK PZTR5A 15 and my new plug the auto store says is the right one, is Autolite Iridium XP5245
The old ones I have out all are dark in the gap but clean and dry. I was told the new ones are pre-gapped to 4 but it doesn't say so on the box.
Somebody said the originals would have been gapped to 6 and later GM changed that spec to 4, so I wonder about that where the new one supposedly at 4 looks the same gap beside the old one. I know not to gap the iridiums.
I am grateful somebody earlier said to save the heat shields so I was not caught by surprise there.
The wire kit came in handy, needed or not for the swap, since I did pull apart one old wire getting it off.
Took it for a spin, ran smoothly, stomped it into passing gear and it revved up like it should, no snaps, no engine light. It all seems a little more lively but hard to tell. Anyway got it done thanks to the help here.
So the garage wanted $400 for that and it cost me $160 instead :)
