I don't know if it's true or not, but I was once told that an old superstock trick was draining the oil and running it, less windage I suppose but bye bye motor. Maybe someone else could confirm or deny that?
That was common on both SS and modified Chevy racers
I never heard of any BB Mopar racers doing that
I did have one of the better SO CA dyno shops make a comment on loosing HP by adding one aditional quart of oil one of my 440 motors I was dynoing there and they where shocked when adding the fifth quart didn't make any measureable differences in torque or HP on that motor
They did a lot of dynoing NHRA Chevy and Ford class motors, SS, Comp and blown alcholol motors
They did share that using the zero weight Royal Purple synthetiic oils in a N/A Comp eliminator motor was good for one pass only, those motors would run faster the first pass on that oil and break on the second pass if you didn't change it
That was back in the late 1990s and early 2000s
Maybe things are better now with those type oils