Are the coil springs on a 69 Mach 1 351w stiffer than the springs on a sportsroof or coupe? If I upgrade to the the ones rated at 620 is it an upgrade from whats already on there? Thanks Mike
Go to www.eatonsprings.com, get the phone number and give their tech support a call. They have all the original prints and specs for springs. I'm sure they can answer your questions.
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