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Discussion Starter #1
Does anyone here know the spring rates of the Edelbrock/Eibach progressive coil springs for 67-70 mustangs?
They offer a small block and a big block version.
 

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Discussion Starter #3
Eibach just said "ask Edelbrock" and that it is a proprietary spring, so all info must come from edelbrock.
 

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Discussion Starter #7
Edelbrock finally replied to my question...

#5244: Drop 1.0" / Rates: 394.0-519.6 lb/ in. (progressive)

#5245: Drop 1.3" / Rates: 474-628.2 lb/ in. (progressive)
 

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Has anyone used the SB Edelbrock / Eibach springs? Are they progressive rate spring? Feedback is appreciated. It seems that they have a very wide tolerance range on the force, I wonder if the numbers are correct?
 
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