Last year I blew the 4.30s I had in my car and put 3.23s I had laying around and my 60ft was still the same 1.50 and the et was still the same, usually 6.9 to 7.2s. That's in an 72 dart with a 499 with a 3,200 stall. I did put shorter tires on 275/50 15 in place of the 295/65 15s. I was shocked to find out it ran exactly the same.