What are the stiffest stock springs? I would rather have model/year than part numbers. But I would like to know lbs rating. And latteral G specs.

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'82 Firebird, dead stock, 9 bolt disc rear, over 200,000 miles and still going strong, more to come...
http://www.spinfrenzy.com/stingerssx...easures.html#4

They're all virtually the same. From what I can tell GM selected the springs for a specific car based on its options and weight. Any FE2 car is going to have the stiffest springs, for identification purposes that would be any Z28, any Trans Am, any GTA, any Iroc. RS's use F41 in most cases which use the same rears but lighter front springs.

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Drew
The lone Thirdgenner of the Apocalypse
predatorman@hotmail.com
My Website
87 Iroc
91 Formula 14.3@98mph
91 RS Convertible
91 Firebird V6FOR SALE!
92 S10FOR SALE!
98 Grand Am GT

Dunno if it helps, but the 2 WS6 cars that I've driven (my 88 GTA and my friend's 86 TA) both ride substantially stiffer than my IROC does, even after switching to Jamex lowering springs in the IROC, which are supposed to be 660lb/in springs in front.

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The IROC Homepage
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View the restoration of an 85 IROC</A>
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You dont want stiff front springs with a street driven car. You will feel EVERY bump, rut, and pothole in the road, and so will your spine and kidneys.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
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Sorry drew, not all Z28s got FE2, my 92 Z vert is F41, and the spring codes match macgyvers 92 RS.

Perhaps verts got the softer springs due to less structural rigidity or even lighter weight (i'm still trying to figure out why verts are thought of as heavy when we are roofless and most importantly hatchless, the little bit of underbody stuff can't weigh that much.)
...ed

My floor jack groans hardy when lifting the Convertible... it lifts all the others with ease. You're right about the convertibles using different springs but they aren't really relevant.

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Drew
The lone Thirdgenner of the Apocalypse
predatorman@hotmail.com
My Website
87 Iroc
91 Formula 14.3@98mph
91 RS Convertible
91 Firebird V6FOR SALE!
92 S10FOR SALE!
98 Grand Am GT

My setup will consist of a softer front anyway, because I like to hook more than push. I think that I'll just go with some aftermarkets.