Our original PSMCDR cam rule of 1%/2% deviation on .050 duration/lobe lift isn't practical to enforce or police at the race when so much is going on. It is easier to attach a good vacuum gauge to the motors and see what they do at 1200 rpm in neutral. Exceptionally quick cars do get the once-over really good with a P&G (measures cubes), Whistler (measures compression ratio), and durometer check of the tires. We will yank a valve cover to see if roller rockers are present and also check torque convertor stall if its an automatic.
It's interesting that guys have found out that high(er) stall convertors hinder good et's on street tires and repro wide ovals. It's too easy to blow the tires off and be consistent, so tight (stock) convertors are the needed to kill too much low end torque.
Dennis
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