The revolutions per mile will change. You can't actually change the gear ratio without physically changing the ring and pinion. I know that you meant what effective change, but it just bugs me when it is referred to as "changing the ratio". Take care. Tom Worthington
If it seems that bracket racing has gotten too expensive for you, maybe you are just doing it wrong.
IMHO, the amount of change in your 60' is usually not going to be a lot for that difference in rollout. But it depends a lot on the converter, and the camshaft/torque curve of your engine. Even tire pressure will affect how much difference you'll see. If you've got a broad flat torque curve, and a loose converter, it may not change a bit. I made a 2" difference in tire height and it didn't change my short times at all, though it did affect RPM at stripe.
Dan "Jim" Moore Much too young to feel this damn old!!