I did 1 coil on a 620# spring= 2" extra........the problem is the spring falls over when you jack it up and release the tension.......I would like to go back to a 1 lowered spring and drop the arm 1 3/4" instead
I cut the stockers on my '68 fastback and cut them 1/4 coil at a time until I got what I wanted. I found 1/4 coil to be equal to about 1/2". If you do it this way make sure to settle the springs before measuring. I drove mine in and out of the garage while steering a bit from side to side.
When do you have to be concerned about binding issues?
I did a 1 inch Shelby drop and currently have 620 1 inch lowering springs. That dropped my height about 1 1/2 inches. I was thinking of dropping it 1 to 1 1/2 more inches.
Currently from the frame under the radiator to the ground is 10 1/2 inches. Just as a refrence.
While you have the springs out, put a jack under your lower control arm and raise it up until it binds. I did that and mine went all the way to the bump stop with no problems in binding at all.
While you have the springs out, put a jack under your lower control arm and raise it up until it binds. I did that and mine went all the way to the bump stop with no problems in binding at all.
My kids' '65 with 289 and 390/510 Pro Motorsports springs drops about 1/2 to 3/4 inch per 1/4 coil.
Speaking of bind, don't do a Shelby drop of more than an inch without changing out your stock upper control arms, or you are likely to bind the upper ball joint with potentially catastrophic results.