[Signman]

SS/S combos are regular old bracket races with Legal Stockers and Super Stockers only. (Super Stockers are actually No Box)

Legal meaning most if not all have passed tech inspection at NHRA & IHRA sanctioned events. Constructed with the limited rules.

Most SS/S Associations will enforce courtesy staging, no deep staging.

Footbrake & No Box bracket cars have no rules other than Transbrake or No Transbrake & ET limitations.

I have no problem racing my stocker in footbrake but do you think a low 9 second tube chassis big block on alcohol would dominate a SS/S Combo?? I know some that do in Footbrake.

Besides, combo races are used by everyone at some point to test with the added value of seeing the change against other cars on the same track and day without national or divisional points implications.