well we got the chevelle down to a 6.90 in th 1/8 mile with no 2nd gear and couldnt stall it up with out slipping and wrong fuel so with a little head work right fuel fly cut the pistions and new roller rockers and new trans we should be in to the low 6's or 6.00s i a 3600 pound street car only missing a back seat full body weight except the fiberglass hood