Quote:
Originally Posted by e vassar
Interesting theory....
Since spark plugs operate at a very high voltage 40K volts or more?...but very low current something measured in miliamps . A very small contact area with the head should be enough grounding....In theory...would like to hear more on this ...these plugs have a tapered seat and no washer to compress. When the seat hits the head...thats it..they dont really turn after that. I dont see how they can be over tightened without causing severe damage. So im going to theorize (again) that the plugs were so hard to get out because they have been in there awhile, and no anti-seize was used.
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You saying taper seat plugs on aluminum head? Didn't think that was possible.