Quote: I have a set of #225 flex a forms, how will they compare in ride and handling to say a set of factory 340 leafs?
How do they work and hold up in drag racing applications?
An A-body with 340 came with leafs with a spring rate of approximately 120 lbs/in. DC books/bulletins state the super stock springs are 160 lbs/in.
So if nothing else has been changed in terms of front spring rates or front/rear vehicle weight, switching to 225 #/in leafs will cause the vehicle to get loose in the rear (aka oversteer) when in sweeper. Many good autocrossers like the rear a little loose for competition. This is not a winning setup for highway speeds and faster. A downhill curve on a rainy day can be equally exciting.
If you are drag racing on slicks, I can't really picture launching on a single leaf without other changes. I guess it probably depends on how hard the car launches, but ideally the chassis will lift and maximize the rear wheel's downward force.
A downhill curve on a rainy day can be equally exciting. 
