I ran 31's in a 85 camaro with a 388sbc shooting a 250 shot on a regular bases. Had a 1.26 60" and 6.06 @ 114 with no problems. I plan to use them in my bu project I have started. Putting them in a 8.8 using safety hubs. I think I have figured out a way to get by the upper control arm angle problem. 8)