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Not for sure if the term "Pure Stock", or "factory stock" really fits any more, since even certified cars are allowed to use the NHRA (not factory) engine specs, plus h-pipes, lite batteries, special radio/heater delete plates and now even non-factory profile cams. Really, about the only difference between PS and Fast is a cubic inch limit in PS. What once was a fun event where the majority of the cars were very close to the way they were driven off of the show room floor, this is no longer true. As the rules continue to deviate from factory specs, will be interesting to see what kind of effect it has on the number of cars participating.
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Tom, there was a lively discussion about this at the v8buick site not long ago:
http://www.v8buick.com/showthread.php?t=68090