Hlep on C5 spark plug gaps please

[yellowshark454]

Hi anyone fitted plugs other than the standard AC Delco ones? The reason I ask is that I am about to fit Denso IT20s. Their website specifies a gap of 1.1mm for the plug but the GM manual specifies 1.52mm for the AC plugs. This is something I have never got into before and I am not sure if the plug gap follows the spark plug or the engine ignition system so therefore feel bewilderingly stupid in not knowing the answer to this.

[ZR1cliff]

The gap normally comes preset for the plugs these days,put a guage on the gap and see if it corrosponds with the measurements you have,what i would do is check all the plugs and if in the main most plugs are the same but there are one or two out reset the ones that are out.

[Boosted LS1]

I don't gap the lsx plugs I install. I use the bosch platinum 2's and go with the gaps recommended by them.

Boosted

[c5ragtop]

I take it that bashing them against the garage wall until they look about right is no longer an option then? Worked fine in the old days.

[Boosted LS1]

c5ragtop said:

I take it that bashing them against the garage wall until they look about right is no longer an option then? Worked fine in the old days.

Bashing them on a vice is much better then use a screw driver to open them up

Boosted.

[yellowshark454]

Not only are garage walls out, so are feeler guages on iridium tips; danger of transferring contaminants