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I am posting this for future users who search for coil overs. And want an option that's cost effective and has the control arm reinforcement . I have had this set on my 1980 from 2017 to present 2020 , There called Pro Shocks GM Coilover Conversion Shocks 200/SR375
Thanks for your tip.
if someone were to replace there stock springs and shocks I'd imagine you'd spend around $300 in parts, so for a little more this seems like a lot better system.
I see these have 375 lb/in springs, which would be soft compared to the 550 springs people commonly discuss.
what was your ride like after the install?
Did you stay with the 375 springs?
Car drives perfectly with them . I might add that I do not have A/c and I have aluminum heads. So I may be a tad lighter then some. The springs have very little adjustment on them for the stance I am set at .
With an extra 100 lbs of load from AC or iron/heads/intake all you have to do is increase the spring load by 1/2 turn or so on the spanner. The 375 lb per inch rate should be a good street spring rate. Stock springs were as low as 250 or 289 even with AC. The 289 rate was the iron head BBs.
There is about 705lbs of sprung weight on each front corner of a C3 that the spring has to support.
So the 250 lb springs compress almost 3 inches, where the 375 lb ones will only compress 2 inches. So you either start with a 1 inch longer spring, or the car winds up 1 inch lower, or you raise the spring perch on the coil-overs. It is much easier to change the ride height with the coil overs than cutting springs, but the end result is the same.
Last edited by leigh1322; Mar 21, 2020 at 12:44 PM.
Front Coil over's
