The engine was cold. Yea, they need to come out eventually. I will try it hot after I try the penetrating oil. The threads seems OK, no loose metal on the plugs that I took out, probably just crud.

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Reed

1987 560 SEC
1980 Triumph Spitfire (drove off the showroom floor) work in progress
1980 Triumph Spitfire (parts car)
1999 Jeep Grand Cherokee (wife's)