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Wait.
On many V8's, pointing all the plug gaps in the same direction will actually mean that they are pointed in different directions relative to the I&E valves in different cylinders.
Also, there's still no conclusive evidence that one orientation is best for all engine types.
How accurate is the "point the gap towards the exhaust valve" rule of thumb?
I also do feel that the indexing washers do have the issue of making the spark plug protrude less into the cylinder. I'm not so much worried about the compression ratio. It's more that the spark starts say 1/8" closer to the edge, and therefore in a less central location.
IF I were to go to the trouble of indexing, buying a whole bunch of plugs would be the way to go. However, based on so many unknowns, unless I have weeks of time and unlimited access to sensitive measuring equipment, I'm not even sure if, for any given application, one orientation is better than any other.
That all said, check out Summit or Jeg's for indexing washers, if that's the way you want to go.
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