TFI ignition upgrade with the 4.0 head swap - spark plug question
I have a 1983 jeep cj and just completed the 4.0l head swap. I have the TFI ignition upgrade and am wondering what spark plugs/gaps should be used??
Should I use 4.0 l plugs, or AMC 258 i6 / 4.2l l plugs?
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