Until about 2004, it was left to the "professionals" and shops that specialized in LS mods.
I remember ongoing forum wars between competing shops, saying that so and so stole their heads/cam idea or tune, etc etc. Lots of dramaorama. The DIY LS guy was not super big till 2004 when there was a large spike in aftermarket-ready parts.
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2/20/2013: They Day the ****s Stopped
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