Join Date: Apr 2000
Location: Columbia, MO USA
Big block springs run from 380 to 400+ and small block springs 325 to 340 or therea bouts. They will probably set the front down 1 1/2" maybe 2" depending on wear and tear on them???
And generally not support the frontend stiffly enough for performance driving, but OK for straight line accelleration (i.e. dragging).
You really can't tell unless you try your stance or rake and see if you actually want your car to look and behave the way it will with the weaker springs.
Sorry, can't be more helpful, but we've beat this stuff about springs to death and generally came to the conclusion that it boils down to a trial and error type deal because we don't seem to come up with a spring constant formula/frontend weight of vehicle that is accurate enough to be able to calculate good enough to suit us.
David Pozzi has advised that he thinks that he's found a spring K formula thats close if you want to do a search on it. But then you will need to weigh the fron half of your car to get front tire loading data for it. Good luck. pdq67