the 80/20 rule is general could be 70/30, 90/10 or anything really it's just an idea, say you got a stock 4bbl 360 with a Holley for tuning and headers. what do you think is the maximum you could get out of it with just cam, if you were a cam manufacture any willing to put crazy money and time at it. There's got to be a limit. Say it's 400 hp, think you could get 80% or more with off the shelf cam ? Also say a common choose cam, xe 268 gets 330 hp do you think a mild 205 @ .050" .425 lift could get you 80% or there etc..
