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Does any one know what the stock spring rate is on the front coil spring in a 66 fairlane GT with a 390 toploader.
 

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From the Moog spring catalog:

#8346:

377 lb/in at 10.5" load height
 

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thats the spring i have, and it is stiff! but comfortable, big car! i had it lowered b4 the whole timed i owned it! w/ a 390 i would think it to be the perfect spring, if staying at that height.
 
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