Shock Help
Howdy Rodney. :D
Those numbers reflect the valving on the shocks as far as extension and compression. A 50/50 number will indicate equal control in both directions. Now to use the 90/10 example, the 90 means it will easily extend & the 10 means it will be harder to compress. Using a drag launch scenario, the front end would easily lift (extend) and be slower to settle down to the stock position. I hope this makes sense...lol.
I used to run some "Gabriel" shocks years ago that look to have been a similar inexpensive shock like the Summit units. They were 90/10 80/20 & 70/30 rated. I'll admit, they weren't the best from a racing standpoint, but I used them for applications similar to yours set at 70/30 and that was a pretty good setting for overall street use.
I think that the 60/40 street setting that you are thinking would be fine. How well they would work in the 90/10 setting at the track would just take some experimenting.