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					Originally Posted by old5.0  Just out of curiosity, why is that?  Understanding that there's a difference between Pure Stock and actual as-delivered-off-the-showroom-floor vehicles, a Pure Stock legal roller cam 5.0 will run low 13's, so what is it about the TPI Chevy that would keep it from doing that? | 
	
 
Off the top of my head, Pure Stock allows an added point and a half of compression, gear ratio changes, bigger exhaust, carb tuning, bigger tires, etc.