My 69 GTX with a 493 has gone as fast as 10.84 at 123.50 with a 1.49 60 ft. 3960lbs with driver, 3.73 gear. This combo makes 494 RWHP.
I made 3 passes with my magnum 500s that had Hoosier drag radials, then switched to my centerlines with the same exact tires. I weighed the wheels and tires at the track as I swapped them. The centerlines were 38 lbs lighter.
After 3 more passes with the Center lines the improvement was.....ZERO!!!!! No change in 60 ft 1/4 mile ET or MPH.
Would it make a difference on a 3000 lbs car? maybe ...
Also tried an electric water pump and fan set up vs 5 blade clutch fan with no improvement in ET or MPH