My experience - ... plugs are generally close when new and out of the box. I check the gap on every one before install. If they are off a few thousands, I simply adjust the gap to what I'm doing (what the book says).
I'm not going to jump into the pre-set or not arguement. But I will say this. If you are adjusting the plug gap by alot (15 or 20 thousands), you are likely adjusting the plug gap further than intended. Unless per-say the plug was dropped on the floor and bent the ground tab into the electrode. Then you'd obviously have to open the gap back up along with inspecting the porcelain.
That said, adjusting 5 thousands is not un-common. I don't think I'd be afraid to adjust as much as 10 thousands. The further you adjust, the more out of square the tab will likely be to the electrode. But the proper gap is more important than squareness (in my opinion). If it's out of square, what's it gonna do? Shorten the life of the plug a bit? If a miss developes as a result of burn off, you should just be able to adjust the gap again. Right? All you really need it to do, is spark. No need in throwing rocket science at a 71 Ford 4400. Just saying.
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