4.70 Thunder class sponsors needed Written by 470Thundergirl on 12/29/16 12:22 PM Duration: – More Than 1 Year Price: $1000 This is a family run class and we are looking for your help to sponsor our class purse and in return get your name/product out there. We run 8 local races and have talked about going out of state to run additional 4.70 races.