How high can ya rev it?

If it has a factory tack I will read 1000 rpms lower then what it is relly turning so if you turn it 6000 it is relley only turning 5000,I know with the factory 6pack & HEMI cars.becuse there is a resister behind the factory tacks that you can take out to make them acuret.I know this from expereance.thats how sum of the smarter s/s racers went a full second faster then some.there dealer would take them out for them the ones that knew it.and as far as turning her take her to were the valves float and back her down 500 rpms,or if you have LOTS of money!!!I have seen the modify production cars go as high as 1500 then start wiging them and god only knows were that was,I have also seen and herd them so high that they would go silent and that is cused buy the pistons going faster then the speed of sound,,OOOOoodamit,and if that don't put chills up your back you must be dead......hope that's a help