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69 Mach 1 coil spring ?

585 views 1 reply 2 participants last post by  jimk 
#1 ·
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
 
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