My 1980 Grand Prix had 231 V6s from the factory. I removed that motor and replaced it with a big block Vortec 454 with stock iron heads. My 36 year old front springs didn't like it at all and the front end sagged A LOT after the change - at least three inches we're talking, maybe more. After some research, I found that these #5610 Moog springs have the same stiffness (420 lb/in) as Monte Carlo SS OEM front springs, but due to their higher uncompressed height compared to SS springs (15.16 inches versus 14.64 inches). , they should bring my car's nose to about the same height as a stock SS. I installed them and sure enough, my Grand Prix's nose is now exactly the same as the V6's. (I have attached before and after photos to illustrate. The wheels have changed, they are all 15 x 7 and they all wear the exact same 235/60 tires. The part is above stock with all my cast iron handling them I wanted to fit a series type so I'm fine If you think it will bother you find a spring with an even higher Co coefficient.
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