[SS Engine Guy]

I didn't see any wording about angled spark plug seats. Adapters to me means going from one size plug to another. (I am aware that these used a "smaller plug") However, an "adapter" has many meanings. Isn't an indexing washer a device that "adapts" plug electrode placement to be in a more favorable location for flame propagation? These weren't installed at the factory. So are those "spark plug indexing adapters" now illegal? I'm sure that Conway knows what he is talking about considering that he engineered them. I guess if you are going to toss Conway's innovation you might as well take a look at all the SS heads that have been welded up and redrilled to optimum plug location. At least we all know that operation is supposedly against the rules and to my knowledge, (inside information limited) never had a letter approving it. For what its worth,(very little) I have several "letters" that aren't worth the paper they are printed on. In my opinion, Conway engineered and got "approved" a device that made some hp.
With that "reminder" I would be very suspicious that someone is trying to get a patent on some similar device under a different name. Not like it hasn't happened before.

Shouldn't the reminder read?: Any device or procedure that causes relocation of the spark plug from its original factory placement or angle is prohibited.
At least it sounds more like someone was indicating a rule and not creating another "grey area".