Just got a new 8" from Kenny at PTC. Gave him my combo specs. He said a 10" wouldn't work for me and suggested an 8". When I got it its got 6-12 after the PTC8TF. what does the 6-12 mean? It's going in a 3000 pound duster back half car, foot brake 904 also built by Kenny, 420 smallblock eddie headed mech. flat tappet hughes 264/268 @.050 motor. It has 12:1 compression, ported M1 intake and a 950cfm Quickfuel Q race carb. Dana with 4.56 gear and a 31 x 13 tire. Knowing the specs what do you think it will flash to. Kenny didn't tell me what it would stall to just that it would be right.